万年历 - java算法实现(3)

3.5500658664, 628.361975567, 0.0000132664, 1.3575E-09, -1.7245E-10, 217, -5, -95, 3 }; public static class ZD { public double Lon;

public double Obl; }

// 计算黄经章动及交角章动 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; }

// 本函数计算赤经章动及赤纬章动

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

private static final double E10[] = { //黄经周期项

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,