Proper Motion

Functions
void LIBNOVA_EXPORT	ln_get_equ_pm (struct ln_equ_posn *mean_position, struct ln_equ_posn *proper_motion, double JD, struct ln_equ_posn *position)
	Calculate a stars equatorial position wrt proper motion (J2000). More...

Detailed Description

Proper motion is the motion in space of a star between 2 epochs. It has components in right ascension and in declination.

All angles are expressed in degrees.

Function Documentation

void ln_get_equ_pm	(	struct ln_equ_posn *	mean_position,
		struct ln_equ_posn *	proper_motion,
		double	JD,
		struct ln_equ_posn *	position
	)

Calculate a stars equatorial position wrt proper motion (J2000).

Parameters

mean_position	Mean position of object.
proper_motion	Annual Proper motion of object.
JD	Julian Day.
position	Pointer to store new object position.

Calculate a stars equatorial coordinates from it's mean coordinates (J2000.0) with the effects of proper motion for a given Julian Day.

Referenced by ln_get_apparent_posn().