~ubuntu-branches/ubuntu/warty/wmmoonclock/warty : revision 1

1

/*

2

* Calculates Moon's position according to Brown's Lunar Theory...

3

*/

4

5

#include <math.h>

6

#define DegPerRad 57.29577951308232087680

7

#define RadPerDeg 0.01745329251994329576

8

9

double angle360();

10

11

12

double TwoPi = 6.283185308;

13

double ARC = 206264.81;

14

double sine(), frac();

15

double DLAM, DLAMS;

16

double DS;

17

double GAM1C;

18

double SINPI;

19

double N;

20

double CO[14][5], SI[14][5];

21

22

double Moon(double T, double *LAMBDA, double *BETA, double *R, double *AGE){

23

24

double T2;

25

double S1, S2, S3, S4, S5, S6, S7;

26

double DL0, DL, DD, DGAM, DLS, DF;

27

double L0, L, LS, F, D;

28

double ARG, FAC;

29

int MAX, i, j;

30

double S;

31

32

33

T2 = T*T;

34

DLAM = 0.0, DS = 0.0, GAM1C = 0.0; SINPI = 3422.7000;

35

36

/*

37

* Long Periodic variations

38

*/

39

S1 = sine( 0.19833 + 0.05611*T );

40

S2 = sine( 0.27869 + 0.04508*T );

41

S3 = sine( 0.16827 - 0.36903*T );

42

S4 = sine( 0.34734 - 5.37261*T );

43

S5 = sine( 0.10498 - 5.37899*T );

44

S6 = sine( 0.42681 - 0.41855*T );

45

S7 = sine( 0.14943 - 5.37511*T );

46

DL0 = 0.84*S1 + 0.31*S2 + 14.27*S3 + 7.26*S4 + 0.28*S5 + 0.24*S6;

47

DL = 2.94*S1 + 0.31*S2 + 14.27*S3 + 9.34*S4 + 1.12*S5 + 0.83*S6;

48

DLS = -6.40*S1 - 1.89*S6;

49

DF = 0.21*S1 + 0.31*S2 + 14.27*S3 - 88.70*S4 - 15.30*S5 + 0.24*S6 - 1.86*S7;

50

DD = DL0 - DLS;

51

DGAM = -3332e-9 * sine( 0.59734 - 5.37261*T)

52

-539e-9 * sine( 0.35498 - 5.37899*T)

53

-64e-9 * sine( 0.39943 - 5.37511*T);

54

55

56

57

L0 = TwoPi*frac( 0.60643382 + 1336.85522467*T - 0.00000313*T2 ) + DL0/ARC;

58

L = TwoPi*frac( 0.37489701 + 1325.55240982*T + 0.00002565*T2 ) + DL/ARC;

59

LS = TwoPi*frac( 0.99312619 + 99.99735956*T - 0.00000044*T2 ) + DLS/ARC;

60

F = TwoPi*frac( 0.25909118 + 1342.22782980*T - 0.00000892*T2 ) + DF/ARC;

61

D = TwoPi*frac( 0.82736186 + 1236.85308708*T - 0.00000397*T2 ) + DD/ARC;

62

63

for (i=1; i<=4; ++i){

64

switch (i){

65

case 1:

66

ARG = L, MAX = 4, FAC = 1.000002208;

67

break;

68

case 2:

69

ARG = LS, MAX = 3, FAC = 0.997504612 - 0.002495388*T;

70

break;

71

case 3:

72

ARG = F, MAX = 4, FAC = 1.000002708 + 139.978*DGAM;

73

break;

74

case 4:

75

ARG = D, MAX = 6, FAC = 1.0;

76

break;

77

}

78

79

CO[6+0][i] = 1.0, CO[6+1][i] = cos(ARG)*FAC;

80

SI[6+0][i] = 0.0, SI[6+1][i] = sin(ARG)*FAC;

81

for (j=2; j<=MAX; ++j) addthe(CO[6+j-1][i], SI[6+j-1][i], CO[6+1][i], SI[6+1][i], &CO[6+j][i], &SI[6+j][i]);

82

for (j=1; j<=MAX; ++j) {

83

CO[6-j][i] = CO[6+j][i];

84

SI[6-j][i] = -SI[6+j][i];

85

}

86

87

88

}

89

90

91

92

/*

93

* Solar1

94

*/

95

addsol( 13.902, 14.06,-0.001, 0.2607,0, 0, 0, 4);

96

addsol( 0.403, -4.01,+0.394, 0.0023,0, 0, 0, 3);

97

addsol( 2369.912, 2373.36,+0.601, 28.2333,0, 0, 0, 2);

98

addsol( -125.154, -112.79,-0.725, -0.9781,0, 0, 0, 1);

99

addsol( 1.979, 6.98,-0.445, 0.0433,1, 0, 0, 4);

100

addsol( 191.953, 192.72,+0.029, 3.0861,1, 0, 0, 2);

101

addsol( -8.466, -13.51,+0.455, -0.1093,1, 0, 0, 1);

102

addsol(22639.500,22609.07,+0.079, 186.5398,1, 0, 0, 0);

103

addsol( 18.609, 3.59,-0.094, 0.0118,1, 0, 0,-1);

104

addsol(-4586.465,-4578.13,-0.077, 34.3117,1, 0, 0,-2);

105

addsol( +3.215, 5.44,+0.192, -0.0386,1, 0, 0,-3);

106

addsol( -38.428, -38.64,+0.001, 0.6008,1, 0, 0,-4);

107

addsol( -0.393, -1.43,-0.092, 0.0086,1, 0, 0,-6);

108

addsol( -0.289, -1.59,+0.123, -0.0053,0, 1, 0, 4);

109

addsol( -24.420, -25.10,+0.040, -0.3000,0, 1, 0, 2);

110

addsol( 18.023, 17.93,+0.007, 0.1494,0, 1, 0, 1);

111

addsol( -668.146, -126.98,-1.302, -0.3997,0, 1, 0, 0);

112

addsol( 0.560, 0.32,-0.001, -0.0037,0, 1, 0,-1);

113

addsol( -165.145, -165.06,+0.054, 1.9178,0, 1, 0,-2);

114

addsol( -1.877, -6.46,-0.416, 0.0339,0, 1, 0,-4);

115

addsol( 0.213, 1.02,-0.074, 0.0054,2, 0, 0, 4);

116

addsol( 14.387, 14.78,-0.017, 0.2833,2, 0, 0, 2);

117

addsol( -0.586, -1.20,+0.054, -0.0100,2, 0, 0, 1);

118

addsol( 769.016, 767.96,+0.107, 10.1657,2, 0, 0, 0);

119

addsol( +1.750, 2.01,-0.018, 0.0155,2, 0, 0,-1);

120

addsol( -211.656, -152.53,+5.679, -0.3039,2, 0, 0,-2);

121

addsol( +1.225, 0.91,-0.030, -0.0088,2, 0, 0,-3);

122

addsol( -30.773, -34.07,-0.308, 0.3722,2, 0, 0,-4);

123

addsol( -0.570, -1.40,-0.074, 0.0109,2, 0, 0,-6);

124

addsol( -2.921, -11.75,+0.787, -0.0484,1, 1, 0, 2);

125

addsol( +1.267, 1.52,-0.022, 0.0164,1, 1, 0, 1);

126

addsol( -109.673, -115.18,+0.461, -0.9490,1, 1, 0, 0);

127

addsol( -205.962, -182.36,+2.056, +1.4437,1, 1, 0,-2);

128

addsol( 0.233, 0.36, 0.012, -0.0025,1, 1, 0,-3);

129

addsol( -4.391, -9.66,-0.471, 0.0673,1, 1, 0,-4);

130

131

132

/*

133

* Solar2

134

*/

135

addsol( 0.283, 1.53,-0.111, +0.0060,1,-1, 0,+4);

136

addsol( 14.577, 31.70,-1.540, +0.2302,1,-1, 0, 2);

137

addsol( 147.687, 138.76,+0.679, +1.1528,1,-1, 0, 0);

138

addsol( -1.089, 0.55,+0.021, 0.0 ,1,-1, 0,-1);

139

addsol( 28.475, 23.59,-0.443, -0.2257,1,-1, 0,-2);

140

addsol( -0.276, -0.38,-0.006, -0.0036,1,-1, 0,-3);

141

addsol( 0.636, 2.27,+0.146, -0.0102,1,-1, 0,-4);

142

addsol( -0.189, -1.68,+0.131, -0.0028,0, 2, 0, 2);

143

addsol( -7.486, -0.66,-0.037, -0.0086,0, 2, 0, 0);

144

addsol( -8.096, -16.35,-0.740, 0.0918,0, 2, 0,-2);

145

addsol( -5.741, -0.04, 0.0 , -0.0009,0, 0, 2, 2);

146

addsol( 0.255, 0.0 , 0.0 , 0.0 ,0, 0, 2, 1);

147

addsol( -411.608, -0.20, 0.0 , -0.0124,0, 0, 2, 0);

148

addsol( 0.584, 0.84, 0.0 , +0.0071,0, 0, 2,-1);

149

addsol( -55.173, -52.14, 0.0 , -0.1052,0, 0, 2,-2);

150

addsol( 0.254, 0.25, 0.0 , -0.0017,0, 0, 2,-3);

151

addsol( +0.025, -1.67, 0.0 , +0.0031,0, 0, 2,-4);

152

addsol( 1.060, 2.96,-0.166, 0.0243,3, 0, 0,+2);

153

addsol( 36.124, 50.64,-1.300, 0.6215,3, 0, 0, 0);

154

addsol( -13.193, -16.40,+0.258, -0.1187,3, 0, 0,-2);

155

addsol( -1.187, -0.74,+0.042, 0.0074,3, 0, 0,-4);

156

addsol( -0.293, -0.31,-0.002, 0.0046,3, 0, 0,-6);

157

addsol( -0.290, -1.45,+0.116, -0.0051,2, 1, 0, 2);

158

addsol( -7.649, -10.56,+0.259, -0.1038,2, 1, 0, 0);

159

addsol( -8.627, -7.59,+0.078, -0.0192,2, 1, 0,-2);

160

addsol( -2.740, -2.54,+0.022, 0.0324,2, 1, 0,-4);

161

addsol( 1.181, 3.32,-0.212, 0.0213,2,-1, 0,+2);

162

addsol( 9.703, 11.67,-0.151, 0.1268,2,-1, 0, 0);

163

addsol( -0.352, -0.37,+0.001, -0.0028,2,-1, 0,-1);

164

addsol( -2.494, -1.17,-0.003, -0.0017,2,-1, 0,-2);

165

addsol( 0.360, 0.20,-0.012, -0.0043,2,-1, 0,-4);

166

addsol( -1.167, -1.25,+0.008, -0.0106,1, 2, 0, 0);

167

addsol( -7.412, -6.12,+0.117, 0.0484,1, 2, 0,-2);

168

addsol( -0.311, -0.65,-0.032, 0.0044,1, 2, 0,-4);

169

addsol( +0.757, 1.82,-0.105, 0.0112,1,-2, 0, 2);

170

addsol( +2.580, 2.32,+0.027, 0.0196,1,-2, 0, 0);

171

addsol( +2.533, 2.40,-0.014, -0.0212,1,-2, 0,-2);

172

addsol( -0.344, -0.57,-0.025, +0.0036,0, 3, 0,-2);

173

addsol( -0.992, -0.02, 0.0 , 0.0 ,1, 0, 2, 2);

174

addsol( -45.099, -0.02, 0.0 , -0.0010,1, 0, 2, 0);

175

addsol( -0.179, -9.52, 0.0 , -0.0833,1, 0, 2,-2);

176

addsol( -0.301, -0.33, 0.0 , 0.0014,1, 0, 2,-4);

177

addsol( -6.382, -3.37, 0.0 , -0.0481,1, 0,-2, 2);

178

addsol( 39.528, 85.13, 0.0 , -0.7136,1, 0,-2, 0);

179

addsol( 9.366, 0.71, 0.0 , -0.0112,1, 0,-2,-2);

180

addsol( 0.202, 0.02, 0.0 , 0.0 ,1, 0,-2,-4);

181

182

/*

183

* Solar3

184

*/

185

addsol( 0.415, 0.10, 0.0 , 0.0013,0, 1, 2, 0);

186

addsol( -2.152, -2.26, 0.0 , -0.0066,0, 1, 2,-2);

187

addsol( -1.440, -1.30, 0.0 , +0.0014,0, 1,-2, 2);

188

addsol( 0.384, -0.04, 0.0 , 0.0 ,0, 1,-2,-2);

189

addsol( +1.938, +3.60,-0.145, +0.0401,4, 0, 0, 0);

190

addsol( -0.952, -1.58,+0.052, -0.0130,4, 0, 0,-2);

191

addsol( -0.551, -0.94,+0.032, -0.0097,3, 1, 0, 0);

192

addsol( -0.482, -0.57,+0.005, -0.0045,3, 1, 0,-2);

193

addsol( 0.681, 0.96,-0.026, 0.0115,3,-1, 0, 0);

194

addsol( -0.297, -0.27, 0.002, -0.0009,2, 2, 0,-2);

195

addsol( 0.254, +0.21,-0.003, 0.0 ,2,-2, 0,-2);

196

addsol( -0.250, -0.22, 0.004, 0.0014,1, 3, 0,-2);

197

addsol( -3.996, 0.0 , 0.0 , +0.0004,2, 0, 2, 0);

198

addsol( 0.557, -0.75, 0.0 , -0.0090,2, 0, 2,-2);

199

addsol( -0.459, -0.38, 0.0 , -0.0053,2, 0,-2, 2);

200

addsol( -1.298, 0.74, 0.0 , +0.0004,2, 0,-2, 0);

201

addsol( 0.538, 1.14, 0.0 , -0.0141,2, 0,-2,-2);

202

addsol( 0.263, 0.02, 0.0 , 0.0 ,1, 1, 2, 0);

203

addsol( 0.426, +0.07, 0.0 , -0.0006,1, 1,-2,-2);

204

addsol( -0.304, +0.03, 0.0 , +0.0003,1,-1, 2, 0);

205

addsol( -0.372, -0.19, 0.0 , -0.0027,1,-1,-2, 2);

206

addsol( +0.418, 0.0 , 0.0 , 0.0 ,0, 0, 4, 0);

207

addsol( -0.330, -0.04, 0.0 , 0.0 ,3, 0, 2, 0);

208

209

N = 0.0;

210

addn(-526.069, 0, 0,1,-2); addn( -3.352, 0, 0,1,-4);

211

addn( +44.297,+1, 0,1,-2); addn( -6.000,+1, 0,1,-4);

212

addn( +20.599,-1, 0,1, 0); addn( -30.598,-1, 0,1,-2);

213

addn( -24.649,-2, 0,1, 0); addn( -2.000,-2, 0,1,-2);

214

addn( -22.571, 0,+1,1,-2); addn( +10.985, 0,-1,1,-2);

215

216

DLAM += +0.82*sine( 0.7736 -62.5512*T ) + 0.31*sine( 0.0466 -125.1025*T )

217

+0.35*sine( 0.5785 -25.1042*T ) + 0.66*sine( 0.4591 +1335.8075*T )

218

+0.64*sine( 0.3130 -91.5680*T ) + 1.14*sine( 0.1480 +1331.2898*T )

219

+0.21*sine( 0.5918 +1056.5859*T ) + 0.44*sine( 0.5784 +1322.8595*T )

220

+0.24*sine( 0.2275 -5.7374*T ) + 0.28*sine( 0.2965 +2.6929*T )

221

+0.33*sine( 0.3132 +6.3368*T );

222

223

224

225

226

227

228

229

230

231

*LAMBDA = 360.0*frac( (L0+DLAM/ARC)/TwoPi );

232

233

S = F + DS/ARC;

234

FAC = 1.000002708 + 139.978*DGAM;

235

*BETA = (FAC*(18518.511 + 1.189 + GAM1C)*sin(S) - 6.24*sin(3*S) + N)/3600.0;

236

237

SINPI *= 0.999953253;

238

*R = ARC/SINPI;

239

240

241

DLAMS = 6893.0 * sin(LS) + 72.0 * sin(2.0*LS);

242

243

*AGE = 29.530589*frac((D+(DLAM-DLAMS)/ARC)/TwoPi);

244

/*

245

printf("Diff = %f\n", 360.0*frac((D+(DLAM-DLAMS)/ARC)/TwoPi));

246

*/

247

248

/*

249

* Return the phase.

250

*/

251

/*

252

return( 0.5*(1.0 - cos(D+(DLAM-DLAMS)/ARC)) );

253

*/

254

return( *AGE/29.530589 );

255

256

257

258

}

259

260

261

double sine(double phi){

262

263

return( sin(TwoPi*frac(phi)) );

264

265

}

266

267

268

double frac(double x){

269

270

x -= (int)x;

271

return( (x<0) ? x+1.0 : x );

272

273

}

274

275

276

277

addsol(double COEFFL, double COEFFS, double COEFFG, double COEFFP, int P, int Q, int R, int S){

278

279

double X, Y;

280

281

term(P, Q, R, S, &X, &Y);

282

DLAM += COEFFL*Y;

283

DS += COEFFS*Y;

284

GAM1C += COEFFG*X;

285

SINPI += COEFFP*X;

286

287

288

}

289

290

291

292

term(int P, int Q, int R, int S, double *X, double *Y){

293

294

double XX, YY;

295

int k, I[5];

296

297

I[1] = P, I[2] = Q, I[3] = R, I[4] = S, XX = 1.0, YY = 0.0;

298

for (k=1; k<=4; ++k){

299

if (I[k] != 0.0){

300

addthe(XX, YY, CO[6+I[k]][k], SI[6+I[k]][k], &XX, &YY);

301

}

302

}

303

*X = XX;

304

*Y = YY;

305

306

}

307

308

309

310

addthe(double C1, double S1, double C2, double S2, double *C, double *S){

311

312

*C = C1*C2 - S1*S2;

313

*S = S1*C2 + C1*S2;

314

315

316

}

317

318

319

addn(double COEFFN, int P, int Q, int R, int S){

320

321

double X, Y;

322

323

term(P, Q, R, S, &X, &Y);

324

N += COEFFN*Y;

325

326

327

}

328

329

330

331

#define R 0.61803399

332

#define C 0.38196601

333

334

double NewMoon(double ax, double bx, double cx){

335

336

double f1, f2, x0, x1, x2, x3, Moon();

337

double L, B, Rad, AGE, tol=1e-7;

338

339

x0 = ax;

340

x3 = cx;

341

if (fabs(cx-bx) > fabs(bx-ax)){

342

x1 = bx;

343

x2 = bx + C*(cx-bx);

344

} else {

345

x2 = bx;

346

x1 = bx - C*(bx-ax);

347

}

348

f1 = Moon(x1, &L, &B, &Rad, &AGE);

349

f2 = Moon(x2, &L, &B, &Rad, &AGE);

350

while (fabs(x3-x0) > tol*(fabs(x1)+fabs(x2))){

351

if (f2 < f1){

352

x0 = x1;

353

x1 = x2;

354

x2 = R*x1+C*x3;

355

f1 = f2;

356

f2 = Moon(x2, &L, &B, &Rad, &AGE);

357

} else {

358

x3 = x2;

359

x2 = x1;

360

x1 = R*x2+C*x0;

361

f2 = f1;

362

f1 = Moon(x1, &L, &B, &Rad, &AGE);

363

}

364

}

365

if (f1 < f2){

366

return(x1);

367

} else {

368

return(x2);

369

}

370

}

371

372

373

374

375

376

/*

377

* MINI_MOON: low precision lunar coordinates (approx. 5'/1')

378

* T : time in Julian centuries since J2000

379

* ( T=(JD-2451545)/36525 )

380

* RA : right ascension (in h; equinox of date)

381

* DEC: declination (in deg; equinox of date)

382

*

383

*/

384

MiniMoon(double T, double *RA, double *DEC){

385

386

double L0,L,LS,F,D,H,S,N,DL,CB,L_MOON,B_MOON,V,W,X,Y,Z,RHO;

387

double frac(), cosEPS, sinEPS, P2, ARC;

388

389

390

cosEPS = 0.91748;

391

sinEPS = 0.39778;

392

P2 = 6.283185307;

393

ARC = 206264.8062;

394

395

396

/*

397

* mean elements of lunar orbit

398

*/

399

L0 = frac(0.606433+1336.855225*T); /* mean longitude Moon (in rev) */

400

L = P2*frac(0.374897+1325.552410*T); /* mean anomaly of the Moon */

401

LS = P2*frac(0.993133+ 99.997361*T); /* mean anomaly of the Sun */

402

D = P2*frac(0.827361+1236.853086*T); /* diff. longitude Moon-Sun */

403

F = P2*frac(0.259086+1342.227825*T); /* mean argument of latitude */

404

DL = +22640.0*sin(L) - 4586.0*sin(L-2.0*D) + 2370.0*sin(2.0*D) + 769.0*sin(2.0*L)

405

-668.0*sin(LS)- 412.0*sin(2.0*F) - 212.0*sin(2.0*L-2.0*D) - 206.0*sin(L+LS-2.0*D)

406

+192.0*sin(L+2.0*D) - 165.0*sin(LS-2.0*D) - 125.0*sin(D) - 110.0*sin(L+LS)

407

+148.0*sin(L-LS) - 55.0*sin(2.0*F-2.0*D);

408

S = F + (DL+412.0*sin(2.0*F)+541.0*sin(LS)) / ARC;

409

H = F-2.0*D;

410

N = -526.0*sin(H) + 44.0*sin(L+H) - 31.0*sin(-L+H) - 23.0*sin(LS+H)

411

+ 11.0*sin(-LS+H) -25.0*sin(-2.0*L+F) + 21.0*sin(-L+F);

412

L_MOON = P2 * frac ( L0 + DL/1296e3 ); /* in rad */

413

B_MOON = ( 18520.0*sin(S) + N ) / ARC; /* in rad */

414

415

/* equatorial coordinates */

416

CB = cos(B_MOON);

417

X = CB*cos(L_MOON);

418

V = CB*sin(L_MOON);

419

W = sin(B_MOON);

420

Y = cosEPS*V-sinEPS*W;

421

Z = sinEPS*V+cosEPS*W;

422

RHO = sqrt(1.0-Z*Z);

423

*DEC = (360.0/P2)*atan2(Z, RHO);

424

*RA = ( 48.0/P2)*atan2(Y, X+RHO);

425

if (*RA<0.0) *RA += 24.0;

426

427

return(0);

428

429

430

}

431

432

433