1 files changed, 94 insertions, 0 deletions
diff --git a/src/cmd/astro/sun.c b/src/cmd/astro/sun.c
new file mode 100644
index 00000000..8821121c
--- /dev/null
+++ b/src/cmd/astro/sun.c
@@ -0,0 +1,94 @@
+#include "astro.h"
+
+void
+sun(void)
+{
+	double mven, merth, mmars, mjup, msat;
+	double dmoon, mmoon, gmoon;
+	double pturbb, pturbl, pturbr, lograd;
+
+	ecc = .01675104 - 4.180e-5 * capt - 1.26e-7*capt2;
+	incl = 0;
+	node = 0;
+	argp = 281.220833 + .0000470684*eday + .000453*capt2
+		 + .000003*capt3;
+	mrad = 1;
+	anom = 358.475845 + .9856002670*eday - .000150*capt2
+		 - .000003*capt3;
+	motion = .9856473354;
+
+	dmoon = 350.737681+12.1907491914*eday-.001436*capt2;
+	gmoon = 11.250889 + 13.2293504490*eday - .003212*capt2;
+	mmoon = 296.104608 + 13.0649924465*eday + 9.192e-3*capt2;
+	mven  = 212.448 + 1.602121635*eday;
+	merth = 358.476 + 0.985600267*eday;
+	mmars = 319.590 + .524024095*eday;
+	mjup = 225.269 + .083082362*eday;
+	msat  = 175.593 + .033450794*eday;
+
+	dmoon = fmod(dmoon, 360.)*radian;
+	gmoon = fmod(gmoon, 360.)*radian;
+	mmoon = fmod(mmoon, 360.)*radian;
+	mven  *= radian;
+	merth *= radian;
+	mmars *= radian;
+	mjup *= radian;
+	msat  *= radian;
+
+	icosadd(sunfp, suncp);
+	anom += cosadd(4, mmars, merth, mven, mjup)/3600.;
+	anom += sinadd(5, mmars, merth, mven, mjup, .07884*capt)/3600.;
+
+	incl *= radian;
+	node *= radian;
+	argp *= radian;
+	anom = fmod(anom, 360.)*radian;
+
+/*
+ *	computation of elliptic orbit
+ */
+
+	lambda = anom + argp;
+
+	pturbl = (6910.057 - 17.240*capt - 0.052*capt2)*sin(anom)
+		 + (72.338 - 0.361*capt) * sin(2.*anom)
+		 + (1.054 - 0.001*capt) * sin(3.*anom)
+		 + 0.018 * sin(4.*anom);
+
+	lambda += pturbl*radsec;
+
+	beta = 0.;
+
+	lograd = (30.57e-6 - 0.15e-6*capt)
+		 - (7274.12e-6 - 18.14e-6*capt - 0.05e-6*capt2)*cos(anom)
+		 - (91.38e-6 - 0.46e-6*capt) * cos(2.*anom)
+		 - (1.45e-6 - 0.01e-6*capt) * cos(3.*anom)
+		 - 0.02e-6 * cos(4.*anom);
+
+	pturbl = cosadd(5, mmars, merth, mven, mjup, msat);
+	pturbl += sinadd(3, dmoon, mmoon, merth) + .9;
+	pturbl *= radsec;
+
+	pturbb =  cosadd(3, merth, mven, mjup);
+	pturbb += sinadd(3, gmoon, mmoon, dmoon);
+	pturbb *= radsec;
+
+	pturbr =  cosadd(5, mmars, merth, mven, mjup, msat);
+	pturbr += cosadd(3, dmoon, mmoon, merth);
+
+	lambda += pturbl;
+	if(lambda > pipi)
+		lambda -= pipi;
+
+	beta += pturbb;
+
+	lograd = (lograd+pturbr) * 2.30258509;
+	rad = 1 + lograd * (1 + lograd * (.5 + lograd/6));
+
+	motion *= radian*mrad*mrad/(rad*rad);
+
+	semi = 961.182;
+	if(flags['o'])
+		semi = 959.63;
+	mag = -26.5;
+}