NovasPrecession Method

public static short Precession(
	double JdTdb1,
	double[] Pos1,
	double JdTdb2,
	ref double[] Pos2
)

Public Shared Function Precession ( 
	JdTdb1 As Double,
	Pos1 As Double(),
	JdTdb2 As Double,
	ByRef Pos2 As Double()
) As Short

Parameters

JdTdb1  Double

TDB Julian date of first epoch. See remarks below.

Pos1  Double

Position vector, geocentric equatorial rectangular coordinates, referred to mean dynamical equator and equinox of first epoch.

JdTdb2  Double

TDB Julian date of second epoch. See remarks below.

Pos2  Double

Position vector, geocentric equatorial rectangular coordinates, referred to mean dynamical equator and equinox of second epoch.

Return Value

            0 ... everything OK
            1 ... Precession not to or from J2000.0; 'JdTdb1' or 'JdTdb2' not 2451545.0.
            

Reference