Angular Separation

Functions
double	ln_get_angular_separation (struct ln_equ_posn *posn1, struct ln_equ_posn *posn2)
	Calculate the angular separation between 2 bodies. More...
double	ln_get_rel_posn_angle (struct ln_equ_posn *posn1, struct ln_equ_posn *posn2)
	Calculate the relative position angle between 2 bodies. More...

Detailed Description

Functions relating to an the angular separation and position angle between 2 bodies.

All angles are expressed in degrees.

Function Documentation

double ln_get_angular_separation	(	struct ln_equ_posn *	posn1,
		struct ln_equ_posn *	posn2
	)

Calculate the angular separation between 2 bodies.

Parameters

posn1	Equatorial position of body 1
posn2	Equatorial position of body 2

Returns

Angular separation in degrees

Calculates the angular separation of 2 bodies. This method was devised by Mr Thierry Pauwels of the Royal Observatory Belgium.

References ln_equ_posn::dec, ln_deg_to_rad(), ln_rad_to_deg(), and ln_equ_posn::ra.

double ln_get_rel_posn_angle	(	struct ln_equ_posn *	posn1,
		struct ln_equ_posn *	posn2
	)

Calculate the relative position angle between 2 bodies.

Parameters

posn1	Equatorial position of body 1
posn2	Equatorial position of body 2

Returns

Position angle in degrees

Calculates the position angle of a body with respect to another body.

References ln_equ_posn::dec, ln_deg_to_rad(), ln_rad_to_deg(), and ln_equ_posn::ra.