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NOVAS31Precession Method
Precesses equatorial rectangular coordinates from one epoch to another.

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.2.0.2774)
Syntax
public short Precession(
	double JdTdb1,
	double[] Pos1,
	double JdTdb2,
	ref double[] Pos2
)

Parameters

JdTdb1
Type: SystemDouble
TDB Julian date of first epoch. See remarks below.
Pos1
Type: SystemDouble
Position vector, geocentric equatorial rectangular coordinates, referred to mean dynamical equator and equinox of first epoch.
JdTdb2
Type: SystemDouble
TDB Julian date of second epoch. See remarks below.
Pos2
Type: SystemDouble
Position vector, geocentric equatorial rectangular coordinates, referred to mean dynamical equator and equinox of second epoch.

Return Value

Type: Int16
 0 ... everything OK
 1 ... Precession not to or from J2000.0; 'JdTdb1' or 'JdTdb2' not 2451545.0.
 
Remarks
One of the two epochs must be J2000.0. The coordinates are referred to the mean dynamical equator and equinox of the two respective epochs.
See Also