#include "sun2000.h"
#include "nav.h"

Include dependency graph for sun2000.c:

Functions
void	sun2000 (int iyr, int iday, double sec, float sun[3], float *rs)

Variables
double	dpsi

double	eps

int	nutime = -9999

Function Documentation

◆ sun2000()

void sun2000	(	int	iyr,
		int	iday,
		double	sec,
		float	sun[3],
		float *	rs
	)

This subroutine computes the Sun vector in geocentric inertial (equatorial) coodinates. It uses the model referenced in The Astronomical Almanac for 1984, Section S (Supplement) and documented in "Exact closed-form geolocation algorithm for Earth survey sensors", by F.S. Patt and W.W. Gregg, Int. Journal of Remote Sensing, 1993. The accuracy of the Sun vector is approximately 0.1 Subprograms referenced: JD Computes Julian day from calendar date EPHPARMS Computes mean solar longitude and anomaly and mean lunar lontitude and ascending node NUTATE Compute nutation corrections to lontitude and obliquityc Coded by: Frederick S. Patt, GSC, November 2, 1992 Modified to include Earth constants subroutine by W. Gregg, May 11, 1993. arcminute.

Parameters

iyr	Year, four digits (i.e, 1993)
iday	Day of year (1-366)
sec	Seconds of day
sun	Unit Sun vector in geocentric inertial coordinates of date
rs	Magnitude of the Sun vector (AU)

arcseconds

Definition at line 8 of file sun2000.c.

Variable Documentation

◆ dpsi

double dpsi

Definition at line 6 of file sun2000.c.

◆ eps

double eps

Definition at line 6 of file sun2000.c.

◆ nutime

int nutime = -9999

Definition at line 7 of file sun2000.c.