Heliocentric time

Functions
double	ln_get_heliocentric_time_diff (double JD, struct ln_equ_posn *object)
	Calculate approximate heliocentric (barycentric) time correction for given date and object.

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Function Documentation

double ln_get_heliocentric_time_diff	(	double	JD,
		struct ln_equ_posn *	object
	)

Calculate approximate heliocentric (barycentric) time correction for given date and object.

Parameters:

JD	Julian day
object	Pointer to object (RA, DEC) for which heliocentric correction will be caculated

Returns:

Heliocentric correction in fraction of day

Calculate heliocentric corection for object at given coordinates and on given date.

References ln_equ_posn::dec, ln_nutation::ecliptic, ln_helio_posn::L, ln_deg_to_rad(), ln_get_earth_helio_coords(), ln_get_nutation(), ln_range_degrees(), ln_helio_posn::R, and ln_equ_posn::ra.