.net core 24节气计算器 by valu C#

调用方法：

solar_terms_util jq = new solar_terms_util();
var target_date = DateTime.Now;
jq.calc_jieqi(target_date);
string jq_text = jq.this_jq; //当前节气
var date1 = jq.this_date; //当前节气开始时间
var date2 = jq.jq.next_date; //下个节气开始时间

代码如下：

/// <summary>
/// 24节气计算器 by valu
/// </summary>
public class solar_terms_util
{
    // ========角度变换===============
    /// <summary>
    /// 每弧度的角秒数
    /// </summary>
    private static double rad = 180 * 3600 / Math.PI;

    /// <summary>
    /// 每弧度的角度数
    /// </summary>
    private static double RAD = 180 / Math.PI;

    // ================日历计算===============
    /// <summary>
    /// 2000年前儒略日数(2000-1-1 12:00:00格林威治平时)
    /// </summary>
    private static double J2000 = 2451545;

    // =========黄赤交角及黄赤坐标变换===========
    /// <summary>
    /// 黄赤交角系数表
    /// </summary>
    private static double[] hcjjB = new double[] { 84381.448, -46.8150, -0.00059, 0.001813 };

    /// <summary>
    /// Date黄道上的岁差p
    /// </summary>
    private static double[] preceB = new double[] { 0, 50287.92262, 111.24406, 0.07699, -0.23479, -0.00178, 0.00018, 0.00001 };

    private double Y = 2000;
    private double M = 1;
    private double D = 1;
    private double h = 12;
    private double m = 0;
    private double s = 0;

    /// <summary>
    /// 世界时与原子时之差计算表
    /// </summary>
    private static double[] dts = {
    -4000, 108371.7, -13036.80, 392.000, 0.0000, -500, 17201.0,
    -627.82, 16.170, -0.3413, -150, 12200.6, -346.41, 5.403, -0.1593,
    150, 9113.8, -328.13, -1.647, 0.0377, 500, 5707.5, -391.41, 0.915,
    0.3145, 900, 2203.4, -283.45, 13.034, -0.1778, 1300, 490.1, -57.35,
    2.085, -0.0072, 1600, 120.0, -9.81, -1.532, 0.1403, 1700, 10.2,
    -0.91, 0.510, -0.0370, 1800, 13.4, -0.72, 0.202, -0.0193, 1830,
    7.8, -1.81, 0.416, -0.0247, 1860, 8.3, -0.13, -0.406, 0.0292, 1880,
    -5.4, 0.32, -0.183, 0.0173, 1900, -2.3, 2.06, 0.169, -0.0135, 1920,
    21.2, 1.69, -0.304, 0.0167, 1940, 24.2, 1.22, -0.064, 0.0031, 1960,
    33.2, 0.51, 0.231, -0.0109, 1980, 51.0, 1.29, -0.026, 0.0032, 2000,
    64.7, -1.66, 5.224, -0.2905, 2150, 279.4, 732.95, 429.579, 0.0158,
    6000 };

    /// <summary>
    /// 取整数部分
    /// </summary>
    /// <param name="v"></param>
    /// <returns></returns>
    public static double int2(double v)
    {
        v = Math.Floor(v);
        if (v < 0)
        {
            return v + 1;
        }
        return v;
    }

    /// <summary>
    /// 对超过0-2PI的角度转为0-2PI
    /// </summary>
    /// <param name="v"></param>
    /// <returns></returns>
    public static double rad2mrad(double v)
    {
        v = v % (2 * Math.PI);
        if (v < 0)
        {
            return v + 2 * Math.PI;
        }
        return v;
    }

    /// <summary>
    /// 计算世界时与原子时之差,传入年
    /// </summary>
    /// <param name="y"></param>
    /// <returns></returns>
    public double deltatT(double y)
    {
        int i = 0;
        for (i = 0; i < 100; i += 5)
        {
            if (y < dts[i + 5] || i == 95)
            {
                break;
            }
        }
        double t1 = (y - dts[i]) / (dts[i + 5] - dts[i]) * 10;
        double t2 = t1 * t1;
        double t3 = t2 * t1;
        return dts[i + 1] + dts[i + 2] * t1 + dts[i + 3] * t2 + dts[i + 4] * t3;
    }

    /// <summary>
    /// 传入儒略日(J2000起算),计算UTC与原子时的差(单位:日)
    /// </summary>
    /// <param name="jd"></param>
    /// <returns></returns>
    public double deltatT2(double jd)
    {
        return this.deltatT(jd / 365.2425 + 2000) / 86400.0;
    }

    /// <summary>
    /// 公历转儒略日,UTC=1表示原日期是UTC
    /// </summary>
    /// <param name="UTC"></param>
    /// <returns></returns>
    public double toJD(bool UTC)
    {
        double y = this.Y; // 取出年月
        double m = this.M;
        double n = 0;

        if (m <= 2)
        {
            m += 12;
            y--;
        }

        if (this.Y * 372 + this.M * 31 + this.D >= 588829)
        {
            // 判断是否为格里高利历日1582*372+10*31+15
            n = int2(y / 100);
            n = 2 - n + int2(n / 4);// 加百年闰
        }

        n += int2(365.2500001 * (y + 4716)); // 加上年引起的偏移日数
        n += int2(30.6 * (m + 1)) + this.D; // 加上月引起的偏移日数及日偏移数
        n += ((this.s / 60 + this.m) / 60 + this.h) / 24 - 1524.5;
        if (UTC)
        {
            return n + this.deltatT2(n - J2000);
        }
        return n;
    }

    /// <summary>
    /// 儒略日数转公历,UTC=1表示目标公历是UTC
    /// </summary>
    /// <param name="jd"></param>
    /// <param name="UTC"></param>
    public void setFromJD(double jd, bool UTC)
    {
        if (UTC)
        {
            jd -= this.deltatT2(jd - J2000);
        }
        jd += 0.5;

        // 取得日数的整数部份A及小数部分F
        double A = int2(jd);
        double F = jd - A;
        double D;

        if (A > 2299161)
        {
            D = int2((A - 1867216.25) / 36524.25);
            A += 1 + D - int2(D / 4);
        }
        A += 1524; // 向前移4年零2个月
        this.Y = int2((A - 122.1) / 365.25);// 年
        D = A - int2(365.25 * this.Y); // 去除整年日数后余下日数
        this.M = int2(D / 30.6001); // 月数
        this.D = D - int2(this.M * 30.6001);// 去除整月日数后余下日数
        this.Y -= 4716;
        this.M--;
        if (this.M > 12)
        {
            this.M -= 12;
        }
        if (this.M <= 2)
        {
            this.Y++;
        }
        // 日的小数转为时分秒
        F *= 24;
        this.h = int2(F);
        F -= this.h;
        F *= 60;
        this.m = int2(F);
        F -= this.m;
        F *= 60;
        this.s = F;
    }

    /// <summary>
    /// 设置时间,参数例:"20000101 120000"或"20000101"
    /// </summary>
    /// <param name="s"></param>
    public void setFromStr(string s)
    {
        this.Y = double.Parse(s.Substring(0, 4));
        this.M = double.Parse(s.Substring(4, 2));
        this.D = double.Parse(s.Substring(6, 2));
        this.h = double.Parse(s.Substring(9, 2));
        this.m = double.Parse(s.Substring(11, 2));
        this.s = double.Parse(s.Substring(13, 2)); /* 将5改为了2 */
    }

    /// <summary>
    /// 日期转为串
    /// </summary>
    /// <returns></returns>
    public string toStr()
    {
        string Y = "     " + (int)this.Y;
        string M = "0" + (int)this.M;
        string D = "0" + (int)this.D;

        double h = this.h, m = this.m, s = Math.Floor(this.s + .5);
        if (s >= 60)
        {
            s -= 60;
            m++;
        }
        if (m >= 60)
        {
            m -= 60;
            h++;
        }
        string sh = "0" + (int)h, sm = "0" + (int)m, ss = "0" + (int)s;
        Y = Y.Substring(Y.Length - 5, 5);
        M = M.Substring(M.Length - 2, 2);
        D = D.Substring(D.Length - 2, 2);
        sh = sh.Substring(sh.Length - 2, 2);
        sm = sm.Substring(sm.Length - 2, 2);
        ss = ss.Substring(ss.Length - 2, 2);
        return Y + "-" + M + "-" + D + " " + sh + ":" + sm + ":" + ss;
    }

    /// <summary>
    /// 算出:jd转到当地UTC后,UTC日数的整数部分或小数部分
    /// 基于J2000力学时jd的起算点是12:00:00时,所以跳日时刻发生在12:00:00,这与日历计算发生矛盾
    /// 把jd改正为00:00:00起算,这样儒略日的跳日动作就与日期的跳日同步
    /// 改正方法为jd=jd+0.5-deltatT+shiqu/24.0
    /// 把儒略日的起点移动-0.5(即前移12小时)
    /// 式中shiqu是时区,北京的起算点是-8小时,shiqu取8
    /// </summary>
    /// <param name="jd"></param>
    /// <param name="shiqu"></param>
    /// <param name="dec"></param>
    /// <returns></returns>
    public double Dint_dec(double jd, int shiqu, bool dec)
    {
        double u = jd + 0.5 - this.deltatT2(jd) + shiqu / 24.0;
        if (dec)
        {
            return Math.Floor(u); // 返回整数部分
        }
        else
        {
            return u - Math.Floor(u); // 返回小数部分
        }
    }

    /// <summary>
    /// 计算两个日期的相差的天数,输入字串格式日期,如:"20080101"
    /// </summary>
    /// <param name="d1"></param>
    /// <param name="d2"></param>
    /// <returns></returns>
    double d1_d2(string d1, string d2)
    {
        double Y = this.Y, M = this.M, D = this.D, h = this.h, m = this.m, s = this.s; // 备份原来的数据

        this.setFromStr(d1.Substring(0, 8) + " 120000");
        double jd1 = this.toJD(false);
        this.setFromStr(d2.Substring(0, 8) + " 120000");
        double jd2 = this.toJD(false);

        this.Y = Y;
        this.M = M;
        this.D = D;
        this.h = h;
        this.m = m;
        this.s = s; // 还原
        if (jd1 > jd2)
        {
            return Math.Floor(jd1 - jd2 + .0001);
        }
        else
        {
            return -Math.Floor(jd2 - jd1 + .0001);
        }
    }

    /// <summary>
    /// 返回黄赤交角(常规精度),短期精度很高
    /// </summary>
    /// <param name="t"></param>
    /// <returns></returns>
    public static double hcjj1(double t)
    {
        double t1 = t / 36525;
        double t2 = t1 * t1;
        double t3 = t2 * t1;
        return (hcjjB[0] + hcjjB[1] * t1 + hcjjB[2] * t2 + hcjjB[3] * t3) / rad;
    }

    /// <summary>
    /// 黄赤转换(黄赤坐标旋转)
    /// </summary>
    /// <param name="JW"></param>
    /// <param name="E"></param>
    public static void HCconv(double[] JW, double E)
    {
        // 黄道赤道坐标变换,赤到黄E取负
        double HJ = rad2mrad(JW[0]), HW = JW[1];
        double sinE = Math.Sin(E), cosE = Math.Cos(E);
        double sinW = cosE * Math.Sin(HW) + sinE * Math.Cos(HW) * Math.Sin(HJ);
        double J = Math.Atan2(Math.Sin(HJ) * cosE - Math.Tan(HW) * sinE, Math.Cos(HJ));
        JW[0] = rad2mrad(J);
        JW[1] = Math.Asin(sinW);
    }

    /// <summary>
    /// 补岁差
    /// </summary>
    /// <param name="jd"></param>
    /// <param name="zb"></param>
    public static void addPrece(double jd, double[] zb)
    {
        int i;
        double t = 1, v = 0, t1 = jd / 365250;
        for (i = 1; i < 8; i++)
        {
            t *= t1;
            v += preceB[i] * t;
        }
        zb[0] = rad2mrad(zb[0] + (v + 2.9965 * t1) / rad);
    }

    // ===============光行差==================
    /// <summary>
    /// 离心率
    /// </summary>
    private static double[] GXC_e = new double[] { 0.016708634, -0.000042037, -0.0000001267 };

    /// <summary>
    /// 近点
    /// </summary>
    private static double[] GXC_p = new double[] { 102.93735 / RAD, 1.71946 / RAD, 0.00046 / RAD };

    /// <summary>
    /// 太平黄经
    /// </summary>
    private static double[] GXC_l = new double[] { 280.4664567 / RAD, 36000.76982779 / RAD, 0.0003032028 / RAD, 1 / 49931000 / RAD, -1 / 153000000 / RAD };

    /// <summary>
    /// 光行差常数
    /// </summary>
    private static double GXC_k = 20.49552 / rad;

    /// <summary>
    /// 恒星周年光行差计算(黄道坐标中)
    /// </summary>
    /// <param name="t"></param>
    /// <param name="zb"></param>
    public static void addGxc(double t, double[] zb)
    {
        double t1 = t / 36525;
        double t2 = t1 * t1;
        double t3 = t2 * t1;
        double t4 = t3 * t1;
        double L = GXC_l[0] + GXC_l[1] * t1 + GXC_l[2] * t2 + GXC_l[3] * t3
                + GXC_l[4] * t4;
        double p = GXC_p[0] + GXC_p[1] * t1 + GXC_p[2] * t2;
        double e = GXC_e[0] + GXC_e[1] * t1 + GXC_e[2] * t2;
        double dL = L - zb[0], dP = p - zb[0];
        zb[0] -= GXC_k * (Math.Cos(dL) - e * Math.Cos(dP)) / Math.Cos(zb[1]);
        zb[1] -= GXC_k * Math.Sin(zb[1]) * (Math.Sin(dL) - e * Math.Sin(dP));
        zb[0] = rad2mrad(zb[0]);
    }

    // ===============章动计算==================
    /// <summary>
    /// 章动表
    /// </summary>
    private static double[] nutB = new double[] {
    2.1824391966, -33.757045954, 0.0000362262, 3.7340E-08, -2.8793E-10,
    -171996, -1742, 92025, 89, 3.5069406862, 1256.663930738,
    0.0000105845, 6.9813E-10, -2.2815E-10, -13187, -16, 5736, -31,
    1.3375032491, 16799.418221925, -0.0000511866, 6.4626E-08,
    -5.3543E-10, -2274, -2, 977, -5, 4.3648783932, -67.514091907,
    0.0000724525, 7.4681E-08, -5.7586E-10, 2062, 2, -895, 5,
    0.0431251803, -628.301955171, 0.0000026820, 6.5935E-10, 5.5705E-11,
    -1426, 34, 54, -1, 2.3555557435, 8328.691425719, 0.0001545547,
    2.5033E-07, -1.1863E-09, 712, 1, -7, 0, 3.4638155059,
    1884.965885909, 0.0000079025, 3.8785E-11, -2.8386E-10, -517, 12,
    224, -6, 5.4382493597, 16833.175267879, -0.0000874129, 2.7285E-08,
    -2.4750E-10, -386, -4, 200, 0, 3.6930589926, 25128.109647645,
    0.0001033681, 3.1496E-07, -1.7218E-09, -301, 0, 129, -1,
    3.5500658664, 628.361975567, 0.0000132664, 1.3575E-09, -1.7245E-10,
    217, -5, -95, 3};

    public class ZD
    {
        public double Lon;
        public double Obl;
    }

    /// <summary>
    /// 计算黄经章动及交角章动
    /// </summary>
    /// <param name="t"></param>
    /// <returns></returns>
    public static ZD nutation(double t)
    {
        ZD d = new ZD();
        d.Lon = 0;
        d.Obl = 0;
        t /= 36525;
        double c, t1 = t, t2 = t1 * t1, t3 = t2 * t1, t4 = t3 * t1;// t5=t4*t1;
        for (int i = 0; i < nutB.Length; i += 9)
        {
            c = nutB[i] + nutB[i + 1] * t1 + nutB[i + 2] * t2 + nutB[i + 3]
                    * t3 + nutB[i + 4] * t4;
            d.Lon += (nutB[i + 5] + nutB[i + 6] * t / 10) * Math.Sin(c); // 黄经章动
            d.Obl += (nutB[i + 7] + nutB[i + 8] * t / 10) * Math.Cos(c); // 交角章动
        }
        d.Lon /= rad * 10000; // 黄经章动
        d.Obl /= rad * 10000; // 交角章动
        return d;
    }

    /// <summary>
    /// 本函数计算赤经章动及赤纬章动
    /// </summary>
    /// <param name="t"></param>
    /// <param name="zb"></param>
    public static void nutationRaDec(double t, double[] zb)
    {
        double Ra = zb[0], Dec = zb[1];
        double E = hcjj1(t), sinE = Math.Sin(E), cosE = Math.Cos(E); // 计算黄赤交角
        ZD d = nutation(t); // 计算黄经章动及交角章动
        double cosRa = Math.Cos(Ra), sinRa = Math.Sin(Ra);
        double tanDec = Math.Tan(Dec);
        zb[0] += (cosE + sinE * sinRa * tanDec) * d.Lon - cosRa * tanDec * d.Obl; // 赤经章动
        zb[1] += sinE * cosRa * d.Lon + sinRa * d.Obl; // 赤纬章动
        zb[0] = rad2mrad(zb[0]);
    }

    //=================以下是月球及地球运动参数表===================
    /***************************************
        * 如果用记事本查看此代码,请在"格式"菜单中去除"自动换行"
        * E10是关于地球的,格式如下:
        *    它是一个数组,每3个数看作一条记录,每条记录的3个数记为A,B,C
        *    rec=A*cos(B+C*t);  式中t是J2000起算的儒略千年数
        *    每条记录的计算结果(即rec)取和即得地球的日心黄经的周期量L0
        * E11格式如下: rec = A*cos*(B+C*t) *t,     取和后得泊松量L1
        * E12格式如下: rec = A*cos*(B+C*t) *t*t,   取和后得泊松量L2
        * E13格式如下: rec = A*cos*(B+C*t) *t*t*t, 取和后得泊松量L3
        * 最后地球的地心黄经:L = L0+L1+L2+L3+...
        * E20,E21,E22,E23...用于计算黄纬
        * M10,M11等是关于月球的,参数的用法请阅读Mnn()函数
        *****************************************/
    //地球运动VSOP87参数
    /// <summary>
    /// 黄经周期项
    /// </summary>
    private static double[] E10 = new double[] {
    1.75347045673, 0.00000000000,     0.0000000000,  0.03341656456, 4.66925680417,  6283.0758499914,  0.00034894275, 4.62610241759, 12566.1516999828,  0.00003417571, 2.82886579606,     3.5231183490,
    0.00003497056, 2.74411800971,  5753.3848848968,  0.00003135896, 3.62767041758, 77713.7714681205,  0.00002676218, 4.41808351397,  7860.4193924392,  0.00002342687, 6.13516237631,  3930.2096962196,
    0.00001273166, 2.03709655772,   529.6909650946,  0.00001324292, 0.74246356352, 11506.7697697936,  0.00000901855, 2.04505443513,    26.2983197998,  0.00001199167, 1.10962944315,  1577.3435424478,
    0.00000857223, 3.50849156957,   398.1490034082,  0.00000779786, 1.17882652114,  5223.6939198022,  0.00000990250, 5.23268129594,  5884.9268465832,  0.00000753141, 2.53339053818,  5507.5532386674,
    0.00000505264, 4.58292563052, 18849.2275499742,  0.00000492379, 4.20506639861,   775.5226113240,  0.00000356655, 2.91954116867,     0.0673103028,  0.00000284125, 1.89869034186,   796.2980068164,
    0.00000242810, 0.34481140906,  5486.7778431750,  0.00000317087, 5.84901952218, 11790.6290886588,  0.00000271039, 0.31488607649, 10977.0788046990,  0.00000206160, 4.80646606059,  2544.3144198834,
    0.00000205385, 1.86947813692,  5573.1428014331,  0.00000202261, 2.45767795458,  6069.7767545534,  0.00000126184, 1.08302630210,    20.7753954924,  0.00000155516, 0.83306073807,   213.2990954380,
    0.00000115132, 0.64544911683,     0.9803210682,  0.00000102851, 0.63599846727,  4694.0029547076,  0.00000101724, 4.26679821365,     7.1135470008,  0.00000099206, 6.20992940258,  2146.1654164752,
    0.00000132212, 3.41118275555,  2942.4634232916,  0.00000097607, 0.68101272270,   155.4203994342,  0.00000085128, 1.29870743025,  6275.9623029906,  0.00000074651, 1.75508916159,  5088.6288397668,
    0.00000101895, 0.97569221824, 15720.8387848784,  0.00000084711, 3.67080093025, 71430.6956181291,  0.00000073547, 4.67926565481,   801.8209311238,  0.00000073874, 3.50319443167,  3154.6870848956,
    0.00000078756, 3.03698313141, 12036.4607348882,  0.00000079637, 1.80791330700, 17260.1546546904,  0.00000085803, 5.98322631256,161000.6857376741,  0.00000056963, 2.78430398043,  6286.5989683404,
    0.00000061148, 1.81839811024,  7084.8967811152,  0.00000069627, 0.83297596966,  9437.7629348870,  0.00000056116, 4.38694880779, 14143.4952424306,  0.00000062449, 3.97763880587,  8827.3902698748,
    0.00000051145, 0.28306864501,  5856.4776591154,  0.00000055577, 3.47006009062,  6279.5527316424,  0.00000041036, 5.36817351402,  8429.2412664666,  0.00000051605, 1.33282746983,  1748.0164130670,
    0.00000051992, 0.18914945834, 12139.5535091068,  0.00000049000, 0.48735065033,  1194.4470102246,  0.00000039200, 6.16832995016, 10447.3878396044,  0.00000035566, 1.77597314691,  6812.7668150860,
    0.00000036770, 6.04133859347, 10213.2855462110,  0.00000036596, 2.56955238628,  1059.3819301892,  0.00000033291, 0.59309499459, 17789.8456197850,  0.00000035954, 1.70876111898,  2352.8661537718};

    /// <summary>
    /// 黄经泊松1项
    /// </summary>
    private static double[] E11 = new double[] {
    6283.31966747491,0.00000000000,     0.0000000000,  0.00206058863, 2.67823455584,  6283.0758499914,  0.00004303430, 2.63512650414, 12566.1516999828,  0.00000425264, 1.59046980729,     3.5231183490,
    0.00000108977, 2.96618001993,  1577.3435424478,  0.00000093478, 2.59212835365, 18849.2275499742,  0.00000119261, 5.79557487799,    26.2983197998,  0.00000072122, 1.13846158196,   529.6909650946,
    0.00000067768, 1.87472304791,   398.1490034082,  0.00000067327, 4.40918235168,  5507.5532386674,  0.00000059027, 2.88797038460,  5223.6939198022,  0.00000055976, 2.17471680261,   155.4203994342,
    0.00000045407, 0.39803079805,   796.2980068164,  0.00000036369, 0.46624739835,   775.5226113240,  0.00000028958, 2.64707383882,     7.1135470008,  0.00000019097, 1.84628332577,  5486.7778431750,
    0.00000020844, 5.34138275149,     0.9803210682,  0.00000018508, 4.96855124577,   213.2990954380,  0.00000016233, 0.03216483047,  2544.3144198834,  0.00000017293, 2.99116864949,  6275.9623029906};

    /// <summary>
    /// 黄经泊松2项
    /// </summary>
    private static double[] E12 = new double[] {
    0.00052918870, 0.00000000000,     0.0000000000,  0.00008719837, 1.07209665242,  6283.0758499914,  0.00000309125, 0.86728818832, 12566.1516999828,  0.00000027339, 0.05297871691,     3.5231183490,
    0.00000016334, 5.18826691036,    26.2983197998,  0.00000015752, 3.68457889430,   155.4203994342,  0.00000009541, 0.75742297675, 18849.2275499742,  0.00000008937, 2.05705419118, 77713.7714681205,
    0.00000006952, 0.82673305410,   775.5226113240,  0.00000005064, 4.66284525271,  1577.3435424478};
    private static double[] E13 = new double[] { 0.00000289226, 5.84384198723, 6283.0758499914, 0.00000034955, 0.00000000000, 0.0000000000, 0.00000016819, 5.48766912348, 12566.1516999828 };
    private static double[] E14 = new double[] { 0.00000114084, 3.14159265359, 0.0000000000, 0.00000007717, 4.13446589358, 6283.0758499914, 0.00000000765, 3.83803776214, 12566.1516999828 };
    private static double[] E15 = new double[] { 0.00000000878, 3.14159265359, 0.0000000000 };

    /// <summary>
    /// 黄纬周期项
    /// </summary>
    private static double[] E20 = new double[] {
    0.00000279620, 3.19870156017, 84334.6615813083,  0.00000101643, 5.42248619256,  5507.5532386674,  0.00000080445, 3.88013204458,  5223.6939198022,  0.00000043806, 3.70444689758,  2352.8661537718,
    0.00000031933, 4.00026369781,  1577.3435424478,  0.00000022724, 3.98473831560,  1047.7473117547,  0.00000016392, 3.56456119782,  5856.4776591154,  0.00000018141, 4.98367470263,  6283.0758499914,
    0.00000014443, 3.70275614914,  9437.7629348870,  0.00000014304, 3.41117857525, 10213.2855462110};
    private static double[] E21 = new double[] { 0.00000009030, 3.89729061890, 5507.5532386674, 0.00000006177, 1.73038850355, 5223.6939198022 };

    /// <summary>
    /// 距离周期项
    /// </summary>
    private static double[] E30 = new double[] {
    1.00013988799, 0.00000000000,     0.0000000000,  0.01670699626, 3.09846350771,  6283.0758499914,  0.00013956023, 3.05524609620, 12566.1516999828,  0.00003083720, 5.19846674381, 77713.7714681205,
    0.00001628461, 1.17387749012,  5753.3848848968,  0.00001575568, 2.84685245825,  7860.4193924392,  0.00000924799, 5.45292234084, 11506.7697697936,  0.00000542444, 4.56409149777,  3930.2096962196};
    private static double[] E31 = new double[] { 0.00103018608, 1.10748969588, 6283.0758499914, 0.00001721238, 1.06442301418, 12566.1516999828, 0.00000702215, 3.14159265359, 0.0000000000 };
    private static double[] E32 = new double[] { 0.00004359385, 5.78455133738, 6283.0758499914 };
    private static double[] E33 = new double[] { 0.00000144595, 4.27319435148, 6283.0758499914 };

    /// <summary>
    /// 月球运动参数
    /// </summary>
    private static double[] M10 = new double[] {
    22639.5858800,  2.3555545723,  8328.6914247251, 1.5231275E-04, 2.5041111E-07,-1.1863391E-09, 4586.4383203,  8.0413790709,  7214.0628654588,-2.1850087E-04,-1.8646419E-07, 8.7760973E-10, 2369.9139357, 10.3969336431, 15542.7542901840,-6.6188121E-05, 6.3946925E-08,-3.0872935E-10,  769.0257187,  4.7111091445, 16657.3828494503, 3.0462550E-04, 5.0082223E-07,-2.3726782E-09,
    -666.4175399, -0.0431256817,   628.3019552485,-2.6638815E-06, 6.1639211E-10,-5.4439728E-11, -411.5957339,  3.2558104895, 16866.9323152810,-1.2804259E-04,-9.8998954E-09, 4.0433461E-11,  211.6555524,  5.6858244986, -1114.6285592663,-3.7081362E-04,-4.3687530E-07, 2.0639488E-09,  205.4359530,  8.0845047526,  6585.7609102104,-2.1583699E-04,-1.8708058E-07, 9.3204945E-10,
    191.9561973, 12.7524882154, 23871.4457149091, 8.6124629E-05, 3.1435804E-07,-1.4950684E-09,  164.7286185, 10.4400593249, 14914.4523349355,-6.3524240E-05, 6.3330532E-08,-2.5428962E-10, -147.3213842, -2.3986802540, -7700.3894694766,-1.5497663E-04,-2.4979472E-07, 1.1318993E-09, -124.9881185,  5.1984668216,  7771.3771450920,-3.3094061E-05, 3.1973462E-08,-1.5436468E-10,
    -109.3803637,  2.3124288905,  8956.9933799736, 1.4964887E-04, 2.5102751E-07,-1.2407788E-09,   55.1770578,  7.1411231536, -1324.1780250970, 6.1854469E-05, 7.3846820E-08,-3.4916281E-10,  -45.0996092,  5.6113650618, 25195.6237400061, 2.4270161E-05, 2.4051122E-07,-1.1459056E-09,   39.5333010, -0.9002559173, -8538.2408905558, 2.8035534E-04, 2.6031101E-07,-1.2267725E-09,
    38.4298346, 18.4383127140, 22756.8171556428,-2.8468899E-04,-1.2251727E-07, 5.6888037E-10,   36.1238141,  7.0666637168, 24986.0742741754, 4.5693825E-04, 7.5123334E-07,-3.5590172E-09,   30.7725751, 16.0827581417, 14428.1257309177,-4.3700174E-04,-3.7292838E-07, 1.7552195E-09,  -28.3971008,  7.9982533891,  7842.3648207073,-2.2116475E-04,-1.8584780E-07, 8.2317000E-10,
    -24.3582283, 10.3538079614, 16171.0562454324,-6.8852003E-05, 6.4563317E-08,-3.6316908E-10,  -18.5847068,  2.8429122493,  -557.3142796331,-1.8540681E-04,-2.1843765E-07, 1.0319744E-09,   17.9544674,  5.1553411398,  8399.6791003405,-3.5757942E-05, 3.2589854E-08,-2.0880440E-10,   14.5302779, 12.7956138971, 23243.1437596606, 8.8788511E-05, 3.1374165E-07,-1.4406287E-09,
    14.3796974, 15.1080427876, 32200.1371396342, 2.3843738E-04, 5.6476915E-07,-2.6814075E-09,   14.2514576,-24.0810366320,    -2.3011998397, 1.5231275E-04, 2.5041111E-07,-1.1863391E-09,   13.8990596, 20.7938672862, 31085.5085803679,-1.3237624E-04, 1.2789385E-07,-6.1745870E-10,   13.1940636,  3.3302699264, -9443.3199839914,-5.2312637E-04,-6.8728642E-07, 3.2502879E-09,
    -9.6790568, -4.7542348263,-16029.0808942018,-3.0728938E-04,-5.0020584E-07, 2.3182384E-09,   -9.3658635, 11.2971895604, 24080.9951807398,-3.4654346E-04,-1.9636409E-07, 9.1804319E-10,    8.6055318,  5.7289501804, -1742.9305145148,-3.6814974E-04,-4.3749170E-07, 2.1183885E-09,   -8.4530982,  7.5540213938, 16100.0685698171, 1.1921869E-04, 2.8238458E-07,-1.3407038E-09,
    8.0501724, 10.4831850066, 14286.1503796870,-6.0860358E-05, 6.2714140E-08,-1.9984990E-10,   -7.6301553,  4.6679834628, 17285.6848046987, 3.0196162E-04, 5.0143862E-07,-2.4271179E-09,   -7.4474952, -0.0862513635,  1256.6039104970,-5.3277630E-06, 1.2327842E-09,-1.0887946E-10,    7.3712011,  8.1276304344,  5957.4589549619,-2.1317311E-04,-1.8769697E-07, 9.8648918E-10,
    7.0629900,  0.9591375719,    33.7570471374,-3.0829302E-05,-3.6967043E-08, 1.7385419E-10,   -6.3831491,  9.4966777258,  7004.5133996281, 2.1416722E-04, 3.2425793E-07,-1.5355019E-09,   -5.7416071, 13.6527441326, 32409.6866054649,-1.9423071E-04, 5.4047029E-08,-2.6829589E-10,    4.3740095, 18.4814383957, 22128.5152003943,-2.8202511E-04,-1.2313366E-07, 6.2332010E-10,
    -3.9976134,  7.9669196340, 33524.3151647312, 1.7658291E-04, 4.9092233E-07,-2.3322447E-09,   -3.2096876, 13.2398458924, 14985.4400105508,-2.5159493E-04,-1.5449073E-07, 7.2324505E-10,   -2.9145404, 12.7093625336, 24499.7476701576, 8.3460748E-05, 3.1497443E-07,-1.5495082E-09,    2.7318890, 16.1258838235, 13799.8237756692,-4.3433786E-04,-3.7354477E-07, 1.8096592E-09,
    -2.5679459, -2.4418059357, -7072.0875142282,-1.5764051E-04,-2.4917833E-07, 1.0774596E-09,   -2.5211990,  7.9551277074,  8470.6667759558,-2.2382863E-04,-1.8523141E-07, 7.6873027E-10,    2.4888871,  5.6426988169,  -486.3266040178,-3.7347750E-04,-4.3625891E-07, 2.0095091E-09,    2.1460741,  7.1842488353, -1952.4799803455, 6.4518350E-05, 7.3230428E-08,-2.9472308E-10,
    1.9777270, 23.1494218585, 39414.2000050930, 1.9936508E-05, 3.7830496E-07,-1.8037978E-09,    1.9336825,  9.4222182890, 33314.7656989005, 6.0925100E-04, 1.0016445E-06,-4.7453563E-09,    1.8707647, 20.8369929680, 30457.2066251194,-1.2971236E-04, 1.2727746E-07,-5.6301898E-10,   -1.7529659,  0.4873576771, -8886.0057043583,-3.3771956E-04,-4.6884877E-07, 2.2183135E-09,
    -1.4371624,  7.0979974718,  -695.8760698485, 5.9190587E-05, 7.4463212E-08,-4.0360254E-10,   -1.3725701,  1.4552986550,  -209.5494658307, 4.3266809E-04, 5.1072212E-07,-2.4131116E-09,    1.2618162,  7.5108957121, 16728.3705250656, 1.1655481E-04, 2.8300097E-07,-1.3951435E-09};
    private static double[] M11 = new double[] {
    1.6768000, -0.0431256817,   628.3019552485,-2.6638815E-06, 6.1639211E-10,-5.4439728E-11,    0.5164200, 11.2260974062,  6585.7609102104,-2.1583699E-04,-1.8708058E-07, 9.3204945E-10,    0.4138300, 13.5816519784, 14914.4523349355,-6.3524240E-05, 6.3330532E-08,-2.5428962E-10,    0.3711500,  5.5402729076,  7700.3894694766, 1.5497663E-04, 2.4979472E-07,-1.1318993E-09,
    0.2756000,  2.3124288905,  8956.9933799736, 1.4964887E-04, 2.5102751E-07,-1.2407788E-09,    0.2459863,-25.6198212459,    -2.3011998397, 1.5231275E-04, 2.5041111E-07,-1.1863391E-09,    0.0711800,  7.9982533891,  7842.3648207073,-2.2116475E-04,-1.8584780E-07, 8.2317000E-10,    0.0612800, 10.3538079614, 16171.0562454324,-6.8852003E-05, 6.4563317E-08,-3.6316908E-10};
    private static double[] M12 = new double[] { 0.0048700, -0.0431256817, 628.3019552485, -2.6638815E-06, 6.1639211E-10, -5.4439728E-11, 0.0022800, -27.1705318325, -2.3011998397, 1.5231275E-04, 2.5041111E-07, -1.1863391E-09, 0.0015000, 11.2260974062, 6585.7609102104, -2.1583699E-04, -1.8708058E-07, 9.3204945E-10 };
    private static double[] M20 = new double[] {
    18461.2400600,  1.6279052448,  8433.4661576405,-6.4021295E-05,-4.9499477E-09, 2.0216731E-11, 1010.1671484,  3.9834598170, 16762.1575823656, 8.8291456E-05, 2.4546117E-07,-1.1661223E-09,  999.6936555,  0.7276493275,  -104.7747329154, 2.1633405E-04, 2.5536106E-07,-1.2065558E-09,  623.6524746,  8.7690283983,  7109.2881325435,-2.1668263E-06, 6.8896872E-08,-3.2894608E-10,
    199.4837596,  9.6692843156, 15647.5290230993,-2.8252217E-04,-1.9141414E-07, 8.9782646E-10,  166.5741153,  6.4134738261, -1219.4032921817,-1.5447958E-04,-1.8151424E-07, 8.5739300E-10,  117.2606951, 12.0248388879, 23976.2204478244,-1.3020942E-04, 5.8996977E-08,-2.8851262E-10,   61.9119504,  6.3390143893, 25090.8490070907, 2.4060421E-04, 4.9587228E-07,-2.3524614E-09,
    33.3572027, 11.1245829706, 15437.9795572686, 1.5014592E-04, 3.1930799E-07,-1.5152852E-09,   31.7596709,  3.0832038997,  8223.9166918098, 3.6864680E-04, 5.0577218E-07,-2.3928949E-09,   29.5766003,  8.8121540801,  6480.9861772950, 4.9705523E-07, 6.8280480E-08,-2.7450635E-10,   15.5662654,  4.0579192538, -9548.0947169068,-3.0679233E-04,-4.3192536E-07, 2.0437321E-09,
    15.1215543, 14.3803934601, 32304.9118725496, 2.2103334E-05, 3.0940809E-07,-1.4748517E-09,  -12.0941511,  8.7259027166,  7737.5900877920,-4.8307078E-06, 6.9513264E-08,-3.8338581E-10,    8.8681426,  9.7124099974, 15019.2270678508,-2.7985829E-04,-1.9203053E-07, 9.5226618E-10,    8.0450400,  0.6687636586,  8399.7091105030,-3.3191993E-05, 3.2017096E-08,-1.5363746E-10,
    7.9585542, 12.0679645696, 23347.9184925760,-1.2754553E-04, 5.8380585E-08,-2.3407289E-10,    7.4345550,  6.4565995078, -1847.7052474301,-1.5181570E-04,-1.8213063E-07, 9.1183272E-10,   -6.7314363, -4.0265854988,-16133.8556271171,-9.0955337E-05,-2.4484477E-07, 1.1116826E-09,    6.5795750, 16.8104074692, 14323.3509980023,-2.2066770E-04,-1.1756732E-07, 5.4866364E-10,
    -6.4600721,  1.5847795630,  9061.7681128890,-6.6685176E-05,-4.3335556E-09,-3.4222998E-11,   -6.2964773,  4.8837157343, 25300.3984729215,-1.9206388E-04,-1.4849843E-08, 6.0650192E-11,   -5.6323538, -0.7707750092,   733.0766881638,-2.1899793E-04,-2.5474467E-07, 1.1521161E-09,   -5.3683961,  6.8263720663, 16204.8433027325,-9.7115356E-05, 2.7023515E-08,-1.3414795E-10,
    -5.3112784,  3.9403341353, 17390.4595376141, 8.5627574E-05, 2.4607756E-07,-1.2205621E-09,   -5.0759179,  0.6845236457,   523.5272223331, 2.1367016E-04, 2.5597745E-07,-1.2609955E-09,   -4.8396143, -1.6710309265, -7805.1642023920, 6.1357413E-05, 5.5663398E-09,-7.4656459E-11,   -4.8057401,  3.5705615768,  -662.0890125485, 3.0927234E-05, 3.6923410E-08,-1.7458141E-10,
    3.9840545,  8.6945689615, 33419.5404318159, 3.9291696E-04, 7.4628340E-07,-3.5388005E-09,    3.6744619, 19.1659620415, 22652.0424227274,-6.8354947E-05, 1.3284380E-07,-6.3767543E-10,    2.9984815, 20.0662179587, 31190.2833132833,-3.4871029E-04,-1.2746721E-07, 5.8909710E-10,    2.7986413, -2.5281611620,-16971.7070481963, 3.4437664E-04, 2.6526096E-07,-1.2469893E-09,
    2.4138774, 17.7106633865, 22861.5918885581,-5.0102304E-04,-3.7787833E-07, 1.7754362E-09,    2.1863132,  5.5132179088, -9757.6441827375, 1.2587576E-04, 7.8796768E-08,-3.6937954E-10,    2.1461692, 13.4801375428, 23766.6709819937, 3.0245868E-04, 5.6971910E-07,-2.7016242E-09,    1.7659832, 11.1677086523, 14809.6776020201, 1.5280981E-04, 3.1869159E-07,-1.4608454E-09,
    -1.6244212,  7.3137297434,  7318.8375983742,-4.3483492E-04,-4.4182525E-07, 2.0841655E-09,    1.5813036,  5.4387584720, 16552.6081165349, 5.2095955E-04, 7.5618329E-07,-3.5792340E-09,    1.5197528, 16.7359480324, 40633.6032972747, 1.7441609E-04, 5.5981921E-07,-2.6611908E-09,    1.5156341,  1.7023646816,-17876.7861416319,-4.5910508E-04,-6.8233647E-07, 3.2300712E-09,
    1.5102092,  5.4977296450,  8399.6847301375,-3.3094061E-05, 3.1973462E-08,-1.5436468E-10,   -1.3178223,  9.6261586339, 16275.8309783478,-2.8518605E-04,-1.9079775E-07, 8.4338673E-10,   -1.2642739, 11.9817132061, 24604.5224030729,-1.3287330E-04, 5.9613369E-08,-3.4295235E-10,    1.1918723, 22.4217725310, 39518.9747380084,-1.9639754E-04, 1.2294390E-07,-5.9724197E-10,
    1.1346110, 14.4235191419, 31676.6099173011, 2.4767216E-05, 3.0879170E-07,-1.4204120E-09,    1.0857810,  8.8552797618,  5852.6842220465, 3.1609367E-06, 6.7664088E-08,-2.2006663E-10,   -1.0193852,  7.2392703065, 33629.0898976466,-3.9751134E-05, 2.3556127E-07,-1.1256889E-09,   -0.8227141, 11.0814572888, 16066.2815125171, 1.4748204E-04, 3.1992438E-07,-1.5697249E-09,
    0.8042238,  3.5274358950,   -33.7870573000, 2.8263353E-05, 3.7539802E-08,-2.2902113E-10,    0.8025939,  6.7832463846, 16833.1452579809,-9.9779237E-05, 2.7639907E-08,-1.8858767E-10,   -0.7931866, -6.3821400710,-24462.5470518423,-2.4326809E-04,-4.9525589E-07, 2.2980217E-09,   -0.7910153,  6.3703481443,  -591.1013369332,-1.5714346E-04,-1.8089785E-07, 8.0295327E-10,
    -0.6674056,  9.1819266386, 24533.5347274576, 5.5197395E-05, 2.7743463E-07,-1.3204870E-09,    0.6502226,  4.1010449356,-10176.3966721553,-3.0412845E-04,-4.3254175E-07, 2.0981718E-09,   -0.6388131,  6.2958887075, 25719.1509623392, 2.3794032E-04, 4.9648867E-07,-2.4069012E-09};
    private static double[] M21 = new double[] {
    0.0743000, 11.9537467337,  6480.9861772950, 4.9705523E-07, 6.8280480E-08,-2.7450635E-10,    0.0304300,  8.7259027166,  7737.5900877920,-4.8307078E-06, 6.9513264E-08,-3.8338581E-10,    0.0222900, 12.8540026510, 15019.2270678508,-2.7985829E-04,-1.9203053E-07, 9.5226618E-10,    0.0199900, 15.2095572232, 23347.9184925760,-1.2754553E-04, 5.8380585E-08,-2.3407289E-10,
    0.0186900,  9.5981921614, -1847.7052474301,-1.5181570E-04,-1.8213063E-07, 9.1183272E-10,    0.0169600,  7.1681781524, 16133.8556271171, 9.0955337E-05, 2.4484477E-07,-1.1116826E-09,    0.0162300,  1.5847795630,  9061.7681128890,-6.6685176E-05,-4.3335556E-09,-3.4222998E-11,    0.0141900, -0.7707750092,   733.0766881638,-2.1899793E-04,-2.5474467E-07, 1.1521161E-09};
    private static double[] M30 = new double[] {
    385000.5290396,  1.5707963268,     0.0000000000, 0.0000000E+00, 0.0000000E+00, 0.0000000E+00,-20905.3551378, 3.9263508990,  8328.6914247251, 1.5231275E-04, 2.5041111E-07,-1.1863391E-09,-3699.1109330,  9.6121753977,  7214.0628654588,-2.1850087E-04,-1.8646419E-07, 8.7760973E-10,-2955.9675626, 11.9677299699, 15542.7542901840,-6.6188121E-05, 6.3946925E-08,-3.0872935E-10,
    -569.9251264,  6.2819054713, 16657.3828494503, 3.0462550E-04, 5.0082223E-07,-2.3726782E-09,  246.1584797,  7.2566208254, -1114.6285592663,-3.7081362E-04,-4.3687530E-07, 2.0639488E-09, -204.5861179, 12.0108556517, 14914.4523349355,-6.3524240E-05, 6.3330532E-08,-2.5428962E-10, -170.7330791, 14.3232845422, 23871.4457149091, 8.6124629E-05, 3.1435804E-07,-1.4950684E-09,
    -152.1378118,  9.6553010794,  6585.7609102104,-2.1583699E-04,-1.8708058E-07, 9.3204945E-10, -129.6202242, -0.8278839272, -7700.3894694766,-1.5497663E-04,-2.4979472E-07, 1.1318993E-09,  108.7427014,  6.7692631483,  7771.3771450920,-3.3094061E-05, 3.1973462E-08,-1.5436468E-10,  104.7552944,  3.8832252173,  8956.9933799736, 1.4964887E-04, 2.5102751E-07,-1.2407788E-09,
    79.6605685,  0.6705404095, -8538.2408905558, 2.8035534E-04, 2.6031101E-07,-1.2267725E-09,   48.8883284,  1.5276706450,   628.3019552485,-2.6638815E-06, 6.1639211E-10,-5.4439728E-11,  -34.7825237, 20.0091090408, 22756.8171556428,-2.8468899E-04,-1.2251727E-07, 5.6888037E-10,   30.8238599, 11.9246042882, 16171.0562454324,-6.8852003E-05, 6.4563317E-08,-3.6316908E-10,
    24.2084985,  9.5690497159,  7842.3648207073,-2.2116475E-04,-1.8584780E-07, 8.2317000E-10,  -23.2104305,  8.6374600436, 24986.0742741754, 4.5693825E-04, 7.5123334E-07,-3.5590172E-09,  -21.6363439, 17.6535544685, 14428.1257309177,-4.3700174E-04,-3.7292838E-07, 1.7552195E-09,  -16.6747239,  6.7261374666,  8399.6791003405,-3.5757942E-05, 3.2589854E-08,-2.0880440E-10,
    14.4026890,  4.9010662531, -9443.3199839914,-5.2312637E-04,-6.8728642E-07, 3.2502879E-09,  -12.8314035, 14.3664102239, 23243.1437596606, 8.8788511E-05, 3.1374165E-07,-1.4406287E-09,  -11.6499478, 22.3646636130, 31085.5085803679,-1.3237624E-04, 1.2789385E-07,-6.1745870E-10,  -10.4447578, 16.6788391144, 32200.1371396342, 2.3843738E-04, 5.6476915E-07,-2.6814075E-09,
    10.3211071,  8.7119194804, -1324.1780250970, 6.1854469E-05, 7.3846820E-08,-3.4916281E-10,   10.0562033,  7.2997465071, -1742.9305145148,-3.6814974E-04,-4.3749170E-07, 2.1183885E-09,   -9.8844667, 12.0539813334, 14286.1503796870,-6.0860358E-05, 6.2714140E-08,-1.9984990E-10,    8.7515625,  6.3563649081, -9652.8694498221,-9.0458282E-05,-1.7656429E-07, 8.3717626E-10,
    -8.3791067,  4.4137085761,  -557.3142796331,-1.8540681E-04,-2.1843765E-07, 1.0319744E-09,   -7.0026961, -3.1834384995,-16029.0808942018,-3.0728938E-04,-5.0020584E-07, 2.3182384E-09,    6.3220032,  9.1248177206, 16100.0685698171, 1.1921869E-04, 2.8238458E-07,-1.3407038E-09,    5.7508579,  6.2387797896, 17285.6848046987, 3.0196162E-04, 5.0143862E-07,-2.4271179E-09,
    -4.9501349,  9.6984267611,  5957.4589549619,-2.1317311E-04,-1.8769697E-07, 9.8648918E-10,   -4.4211770,  3.0260949818,  -209.5494658307, 4.3266809E-04, 5.1072212E-07,-2.4131116E-09,    4.1311145, 11.0674740526,  7004.5133996281, 2.1416722E-04, 3.2425793E-07,-1.5355019E-09,   -3.9579827, 20.0522347225, 22128.5152003943,-2.8202511E-04,-1.2313366E-07, 6.2332010E-10,
    3.2582371, 14.8106422192, 14985.4400105508,-2.5159493E-04,-1.5449073E-07, 7.2324505E-10,   -3.1483020,  4.8266068163, 16866.9323152810,-1.2804259E-04,-9.8998954E-09, 4.0433461E-11,    2.6164092, 14.2801588604, 24499.7476701576, 8.3460748E-05, 3.1497443E-07,-1.5495082E-09,    2.3536310,  9.5259240342,  8470.6667759558,-2.2382863E-04,-1.8523141E-07, 7.6873027E-10,
    -2.1171283, -0.8710096090, -7072.0875142282,-1.5764051E-04,-2.4917833E-07, 1.0774596E-09,   -1.8970368, 17.6966801503, 13799.8237756692,-4.3433786E-04,-3.7354477E-07, 1.8096592E-09,   -1.7385258,  2.0581540038, -8886.0057043583,-3.3771956E-04,-4.6884877E-07, 2.2183135E-09,   -1.5713944, 22.4077892948, 30457.2066251194,-1.2971236E-04, 1.2727746E-07,-5.6301898E-10,
    -1.4225541, 24.7202181853, 39414.2000050930, 1.9936508E-05, 3.7830496E-07,-1.8037978E-09,   -1.4189284, 17.1661967915, 23314.1314352759,-9.9282182E-05, 9.5920387E-08,-4.6309403E-10,    1.1655364,  3.8400995356,  9585.2953352221, 1.4698499E-04, 2.5164390E-07,-1.2952185E-09,   -1.1169371, 10.9930146158, 33314.7656989005, 6.0925100E-04, 1.0016445E-06,-4.7453563E-09,
    1.0656723,  1.4845449633,  1256.6039104970,-5.3277630E-06, 1.2327842E-09,-1.0887946E-10,    1.0586190, 11.9220903668,  8364.7398411275,-2.1850087E-04,-1.8646419E-07, 8.7760973E-10,   -0.9333176,  9.0816920389, 16728.3705250656, 1.1655481E-04, 2.8300097E-07,-1.3951435E-09,    0.8624328, 12.4550876470,  6656.7485858257,-4.0390768E-04,-4.0490184E-07, 1.9095841E-09,
    0.8512404,  4.3705828944,    70.9876756153,-1.8807069E-04,-2.1782126E-07, 9.7753467E-10,   -0.8488018, 16.7219647962, 31571.8351843857, 2.4110126E-04, 5.6415276E-07,-2.6269678E-09,   -0.7956264,  3.5134526588, -9095.5551701890, 9.4948529E-05, 4.1873358E-08,-1.9479814E-10};
    private static double[] M31 = new double[] {
    0.5139500, 12.0108556517, 14914.4523349355,-6.3524240E-05, 6.3330532E-08,-2.5428962E-10,    0.3824500,  9.6553010794,  6585.7609102104,-2.1583699E-04,-1.8708058E-07, 9.3204945E-10,    0.3265400,  3.9694765808,  7700.3894694766, 1.5497663E-04, 2.4979472E-07,-1.1318993E-09,    0.2639600,  0.7416325637,  8956.9933799736, 1.4964887E-04, 2.5102751E-07,-1.2407788E-09,
    0.1230200, -1.6139220085,   628.3019552485,-2.6638815E-06, 6.1639211E-10,-5.4439728E-11,    0.0775400,  8.7830116346, 16171.0562454324,-6.8852003E-05, 6.4563317E-08,-3.6316908E-10,    0.0606800,  6.4274570623,  7842.3648207073,-2.2116475E-04,-1.8584780E-07, 8.2317000E-10,    0.0497000, 12.0539813334, 14286.1503796870,-6.0860358E-05, 6.2714140E-08,-1.9984990E-10};

    /// <summary>
    /// 月球平黄经系数
    /// </summary>
    private static double[] M1n = new double[] { 3.81034392032, 8.39968473021E+03, -3.31919929753E-05, 3.20170955005E-08, -1.53637455544E-10 };

    // ==================日位置计算===================
    /// <summary>
    /// 调用Enn前先设置EnnT时间变量
    /// </summary>
    private double EnnT = 0;

    /// <summary>
    /// 计算E10,E11,E20等,即:某一组周期项或泊松项算出,计算前先设置EnnT时间
    /// </summary>
    /// <param name="F"></param>
    /// <returns></returns>
    public double Enn(double[] F)
    {
        double v = 0;
        for (int i = 0; i < F.Length; i += 3)
        {
            v += F[i] * Math.Cos(F[i + 1] + EnnT * F[i + 2]);
        }
        return v;
    }

    /// <summary>
    /// 返回地球位置,日心Date黄道分点坐标
    /// </summary>
    /// <param name="jd"></param>
    /// <returns></returns>
    public double[] earCal(double jd)
    {
        EnnT = jd / 365250;
        double[] llr = new double[3];
        double t1 = EnnT, t2 = t1 * t1, t3 = t2 * t1, t4 = t3 * t1, t5 = t4 * t1;
        llr[0] = Enn(E10) + Enn(E11) * t1 + Enn(E12) * t2 + Enn(E13) * t3 + Enn(E14) * t4 + Enn(E15) * t5;
        llr[1] = Enn(E20) + Enn(E21) * t1;
        llr[2] = Enn(E30) + Enn(E31) * t1 + Enn(E32) * t2 + Enn(E33) * t3;
        llr[0] = rad2mrad(llr[0]);
        return llr;
    }

    /// <summary>
    /// 传回jd时刻太阳的地心视黄经及黄纬
    /// </summary>
    /// <param name="jd"></param>
    /// <returns></returns>
    public double[] sunCal2(double jd)
    {
        double[] sun = earCal(jd);
        sun[0] += Math.PI;
        sun[1] = -sun[1]; // 计算太阳真位置
        ZD d = nutation(jd);
        sun[0] = rad2mrad(sun[0] + d.Lon); // 补章动
        addGxc(jd, sun); // 补周年黄经光行差
        return sun; // 返回太阳视位置
    }

    // ==================月位置计算===================
    /// <summary>
    /// 调用Mnn前先设置MnnT时间变量
    /// </summary>
    private double MnnT = 0;

    /// <summary>
    /// 计算M10,M11,M20等,计算前先设置MnnT时间
    /// </summary>
    /// <param name="F"></param>
    /// <returns></returns>
    public double Mnn(double[] F)
    {
        double v = 0, t1 = MnnT, t2 = t1 * t1, t3 = t2 * t1, t4 = t3 * t1;
        for (int i = 0; i < F.Length; i += 6)
        {
            v += F[i]
                    * Math.Sin(F[i + 1] + t1 * F[i + 2] + t2 * F[i + 3] + t3
                    * F[i + 4] + t4 * F[i + 5]);
        }
        return v;
    }

    /// <summary>
    /// 返回月球位置,返回地心Date黄道坐标
    /// </summary>
    /// <param name="jd"></param>
    /// <returns></returns>
    public double[] moonCal(double jd)
    {
        MnnT = jd / 36525;
        double t1 = MnnT, t2 = t1 * t1, t3 = t2 * t1, t4 = t3 * t1;
        double[] llr = new double[3];
        llr[0] = (Mnn(M10) + Mnn(M11) * t1 + Mnn(M12) * t2) / rad;
        llr[1] = (Mnn(M20) + Mnn(M21) * t1) / rad;
        llr[2] = (Mnn(M30) + Mnn(M31) * t1) * 0.999999949827;
        llr[0] = llr[0] + M1n[0] + M1n[1] * t1 + M1n[2] * t2 + M1n[3] * t3 + M1n[4] * t4;
        llr[0] = rad2mrad(llr[0]); // 地心Date黄道原点坐标(不含岁差)
        addPrece(jd, llr); // 补岁差
        return llr;
    }

    /// <summary>
    /// 传回月球的地心视黄经及视黄纬
    /// </summary>
    /// <param name="jd"></param>
    /// <returns></returns>
    public double[] moonCal2(double jd)
    {
        double[] moon = moonCal(jd);
        ZD d = nutation(jd);
        moon[0] = rad2mrad(moon[0] + d.Lon); // 补章动
        return moon;
    }

    /// <summary>
    /// 传回月球的地心视赤经及视赤纬
    /// </summary>
    /// <param name="jd"></param>
    /// <returns></returns>
    public double[] moonCal3(double jd)
    {
        double[] moon = moonCal(jd);
        HCconv(moon, hcjj1(jd));
        nutationRaDec(jd, moon); // 补赤经及赤纬章动
                                    // 如果黄赤转换前补了黄经章动及交章动,就不能再补赤经赤纬章动
        return moon;
    }

    /// <summary>
    /// 地心坐标中的日月位置计算
    /// </summary>
    /// <param name="lx"></param>
    /// <param name="t"></param>
    /// <param name="jiao"></param>
    /// <returns></returns>
    public double jiaoCai(int lx, double t, double jiao)
    {
        // lx=1时计算t时刻日月角距与jiao的差, lx=0计算t时刻太阳黄经与jiao的差
        double[] sun = earCal(t); // 计算太阳真位置(先算出日心坐标中地球的位置)
        sun[0] += Math.PI;
        sun[1] = -sun[1]; // 转为地心坐标
        addGxc(t, sun); // 补周年光行差
        if (lx == 0)
        {
            ZD d = nutation(t);
            sun[0] += d.Lon; // 补黄经章动
            return rad2mrad(jiao - sun[0]);
        }
        double[] moon = moonCal(t); // 日月角差与章动无关
        return rad2mrad(jiao - (moon[0] - sun[0]));
    }

    /// <summary>
    /// 已知位置反求时间
    /// </summary>
    /// <param name="t1"></param>
    /// <param name="jiao"></param>
    /// <param name="lx"></param>
    /// <returns></returns>
    public double jiaoCal(double t1, double jiao, int lx)
    {
        // t1是J2000起算儒略日数
        // 已知角度(jiao)求时间(t)
        // lx=0是太阳黄经达某角度的时刻计算(用于节气计算)
        // lx=1是日月角距达某角度的时刻计算(用于定朔望等)
        // 传入的t1是指定角度对应真时刻t的前一些天
        // 对于节气计算,应满足t在t1到t1+360天之间,对于Y年第n个节气(n=0是春分),t1可取值Y*365.2422+n*15.2
        // 对于朔望计算,应满足t在t1到t1+25天之间,在此范围之外,求右边的根
        double t2 = t1, t = 0, v;
        if (lx == 0)
        {
            t2 += 360; // 在t1到t2范围内求解(范气360天范围),结果置于t
        }
        else
        {
            t2 += 25;
        }
        jiao *= Math.PI / 180; // 待搜索目标角
                                // 利用截弦法计算
        double v1 = jiaoCai(lx, t1, jiao); // v1,v2为t1,t2时对应的黄经
        double v2 = jiaoCai(lx, t2, jiao);
        if (v1 < v2)
        {
            v2 -= 2 * Math.PI; // 减2pi作用是将周期性角度转为连续角度
        }
        double k = 1, k2; // k是截弦的斜率
        for (int i = 0; i < 10; i++)
        { // 快速截弦求根,通常截弦三四次就已达所需精度
            k2 = (v2 - v1) / (t2 - t1); // 算出斜率
            if (Math.Abs(k2) > 1e-15)
            {
                k = k2; // 差商可能为零,应排除
            }
            t = t1 - v1 / k;
            v = jiaoCai(lx, t, jiao);// 直线逼近法求根(直线方程的根)
            if (v > 1)
            {
                v -= 2 * Math.PI; // 一次逼近后,v1就已接近0,如果很大,则应减1周
            }
            if (Math.Abs(v) < 1e-8)
            {
                break; // 已达精度
            }
            t1 = t2;
            v1 = v2;
            t2 = t;
            v2 = v; // 下一次截弦
        }
        return t;
    }

    //==================节气计算===================
    /// <summary>
    /// 节气表
    /// </summary>
    public static string[] jqB = new string[] {
    "春分","清明","谷雨","立夏","小满","芒种","夏至","小暑","大暑","立秋","处暑","白露",
    "秋分","寒露","霜降","立冬","小雪","大雪","冬至","小寒","大寒","立春","雨水","惊蛰"};

    int calc_times = 0;
    bool calculated = false, calculated_next = false;
    public string this_jq;
    public DateTime this_date, next_date;
    public string calc_jieqi(DateTime target_date)
    {
        double jd = 365.2422 * (target_date.Year - 2000), q;
        string s1, s2;
        string result = "";
        for (int i = 0; i < 24; i++)
        {
            q = jiaoCal(jd + i * 15.2, i * 15, 0);
            q = q + J2000 + (double)8 / 24; // 计算第i个节气(i=0是春风),结果转为北京时
            setFromJD(q, true);
            s1 = toStr(); // 将儒略日转成世界时
            var date1 = DateTime.Parse(s1);
            Console.WriteLine($"======================================");
            Console.WriteLine($"target_date={target_date.ToString("yyyy-MM-dd HH:mm:ss")}");
            Console.WriteLine($"      date1={date1.ToString("yyyy-MM-dd HH:mm:ss")}");
            if (!calculated_next && calc_times == 1)
            {
                next_date = date1;
                calculated_next = true;
                Console.WriteLine($"下个节气为：{jqB[i]}[{next_date.ToString("yyyy-MM-dd HH:mm:ss")}]");
            }
            if (!calculated && target_date.AddDays(-15) < date1)
            {
                this_date = date1;
                this_jq = jqB[i];
                calc_times++;
                calculated = true;
                Console.WriteLine($"本节气为：{jqB[i]}[{date1.ToString("yyyy-MM-dd HH:mm:ss")}]");
            }
            setFromJD(q, false);
            s2 = toStr(); // 将儒略日转成日期格式(输出日期形式的力学时)
                            //Console.WriteLine(jqB[i] + " : " + s1 + " " + s2); // 显示
            result = result + jqB[i] + " : " + s1 + " " + s2 + "\n";
        }
        return result;
    }

    /// <summary>
    /// 节气使计算范例
    /// </summary>
    /// <param name="y">y是年分,这是个测试函数</param>
    /// <returns></returns>
    public string JQtest(int y)
    {
        double jd = 365.2422 * (y - 2000), q;
        string s1, s2;
        string result = "";
        for (int i = 0; i < 24; i++)
        {
            q = jiaoCal(jd + i * 15.2, i * 15, 0);
            q = q + J2000 + (double)8 / 24; // 计算第i个节气(i=0是春风),结果转为北京时
            setFromJD(q, true);
            s1 = toStr(); // 将儒略日转成世界时
            setFromJD(q, false);
            s2 = toStr(); // 将儒略日转成日期格式(输出日期形式的力学时)
                            //Console.WriteLine(jqB[i] + " : " + s1 + " " + s2); // 显示
            result = result + jqB[i] + " : " + s1 + " " + s2 + "\n";
        }
        return result;
    }

    /// <summary>
    /// 定朔弦望计算
    /// </summary>
    /// <param name="y"></param>
    /// <param name="arc"></param>
    public void dingSuo(int y, double arc)
    { // 这是个测试函数
        double jd = 365.2422 * (y - 2000), q;
        string s1, s2;
        //Console.WriteLine("月份:世界时  原子时");
        for (int i = 0; i < 12; i++)
        {
            q = jiaoCal(jd + 29.5 * i, arc, 1) + J2000 + 8 / 24; // 计算第i个节气(i=0是春风),结果转为北京时
            setFromJD(q, true);
            s1 = toStr(); // 将儒略日转成世界时
            setFromJD(q, false);
            s2 = toStr(); // 将儒略日转成日期格式(输出日期形式的力学时)
                            //Console.WriteLine((i + 1) + "月 : " + s1 + " " + s2); // 显示
        }
    }

    //=================农历计算========================
    /*****
        * 1.冬至所在的UTC日期保存在A[0],根据"规定1"得知在A[0]之前(含A[0])的那个UTC朔日定为年首日期
        * 冬至之后的中气分保存在A[1],A[2],A[3]...A[13],其中A[12]又回到了冬至,共计算13次中气
        * 2.连续计算冬至后14个朔日,即起算时间时A[0]+1 14个朔日编号为0,1...12,保存在C[0],C[1]...C[13]
        * 这14个朔日表示编号为0月,1月,...12月0月的各月终止日期,但要注意实际终止日是新月初一,不属本月
        * 这14个朔日同样表示编号为1月,2月...的开始日期
        * 设某月编号为n,那么开始日期为C[n-1],结束日期为C[n],如果每月都含中气,该月所含的中气为A[n]
        * 注:为了全总计算出13个月的大小月情况,须算出14个朔日。 3.闰年判断:含有13个月的年份是闰年 当第13月(月编号12月)终止日期大于冬至日,
        * 即C[12]〉A[12], 那么该月是新年,本年没月12月,本年共12个月
        * 当第13月(月编号12月)终止日期小等于冬至日,即C[12]≤A[12],那么该月是本年的有效月份,本年共13个月 4.闰年中处理闰月:
        * 13个月中至少1个月份无中气,首个无中气的月置闰,在n=1...12月中找到闰月,即C[n]≤A[n]
        * 从农历年首的定义知道,0月一定含有中气冬至,所以不可能是闰月。 首月有时很贪心,除冬至外还可能再吃掉本年或前年的另一个中气
        * 定出闰月后,该月及以后的月编号减1 5.以上所述的月编号不是日常生活中说的"正月","二月"等月名称:
        * 如果"建子",0月为首月,如果"建寅",2月的月名"正月",3月是"二月",其余类推
        *****/
    private static string[] yueMing = new string[] { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二" };

    public string paiYue(int y)
    { // 农历排月序计算,可定出农历
        double[] zq = new double[20];
        double[] jq = new double[20];
        double[] hs = new double[20];

        // var zq=new Array(),jq=new Array(), hs=new Array(); //中气表,节气表,日月合朔表

        // 从冬至开始,连续计算14个中气时刻
        int i;
        double t1 = 365.2422 * (y - 2000) - 50; // 农历年首始于前一年的冬至,为了节气中气一起算,取前年大雪之前
        for (i = 0; i < 14; i++)
        { // 计算节气(从冬至开始),注意:返回的是力学时
            zq[i] = jiaoCal(t1 + i * 30.4, i * 30 - 90, 0); // 中气计算,冬至的太阳黄经是270度(或-90度)
            jq[i] = jiaoCal(t1 + i * 30.4, i * 30 - 105, 0); // 顺便计算节气,它不是农历定朔计算所必需的
        }
        // 在冬至过后,连续计算14个日月合朔时刻
        double dongZhiJia1 = zq[0] + 1 - Dint_dec(zq[0], 8, false); // 冬至过后的第一天0点的儒略日数
        hs[0] = jiaoCal(dongZhiJia1, 0, 1); // 首月结束的日月合朔时刻
        for (i = 1; i < 14; i++)
        {
            hs[i] = jiaoCal(hs[i - 1] + 25, 0, 1);
        }
        // 算出中气及合朔时刻的日数(不含小数的日数计数,以便计算日期之间的差值)
        double[] A = new double[20];
        double[] B = new double[20];
        double[] C = new double[20];
        // var A=new Array(), B=new Array(), C=new Array();
        for (i = 0; i < 14; i++)
        { // 取当地UTC日数的整数部分
            A[i] = Dint_dec(zq[i], 8, true);
            B[i] = Dint_dec(jq[i], 8, true);
            C[i] = Dint_dec(hs[i], 8, true);
        }
        // 闰月及大小月分析
        int tot = 12, nun = -1;
        int[] yn = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0, 0 }; // 月编号
        if (C[12] <= A[12])
        { // 闰月分析
            yn[12] = 12;
            tot = 13; // 编号为12的月是本年的有效月份,本年总月数13个
            for (i = 1; i < 13; i++)
            {
                if (C[i] <= A[i])
                {
                    break;
                }
            }
            for (nun = i - 1; i < 13; i++)
            {
                yn[i - 1]--; // 注意yn中不含农历首月(所以取i-1),在公历中农历首月总是去年的所以不多做计算
            }
        }
        string[] syn = new string[20];
        for (i = 0; i < tot; i++)
        { // 转为建寅月名,并做大小月分析
            syn[i] = yueMing[(yn[i] + 10) % 12]; // 转建寅月名
            if (i == nun)
            {
                syn[i] += "闰";
            }
            else
            {
                syn[i] += "月"; // 标记是否闰月
            }
            if (C[i + 1] - C[i] > 29)
            {
                syn[i] += "大";
            }
            else
            {
                syn[i] += "小"; // 标记大小月
            }
        }
        // 显示
        string out_str = "节气    手表时            中气    手表时            农历月   朔的手表时\n";
        for (i = 0; i < tot; i++)
        {
            int zm = (i * 2 + 18) % 24;
            int jm = (i * 2 + 17) % 24; // 中气名节气名
            setFromJD(jq[i] + J2000 + (double)8 / 24, true);
            out_str += jqB[jm] + ":" + toStr() + " "; // 显示节气
            setFromJD(zq[i] + J2000 + (double)8 / 24, true);
            out_str += jqB[zm] + ":" + toStr() + " "; // 显示中气
            setFromJD(hs[i] + J2000 + (double)8 / 24, true);
            out_str += syn[i] + ":" + toStr() + "\n"; // 显示日月合朔
        }
        //Console.WriteLine(out_str);
        return out_str;
    }
}