NovasGravDef Method

public static short GravDef(
	double JdTdb,
	EarthDeflection LocCode,
	Accuracy Accuracy,
	double[] Pos1,
	double[] PosObs,
	ref double[] Pos2
)

Public Shared Function GravDef ( 
	JdTdb As Double,
	LocCode As EarthDeflection,
	Accuracy As Accuracy,
	Pos1 As Double(),
	PosObs As Double(),
	ByRef Pos2 As Double()
) As Short

Parameters

JdTdb  Double

TDB Julian date of observation.

LocCode  EarthDeflection

Code for location of observer, determining whether the gravitational deflection due to the earth itself is applied.

Accuracy  Accuracy

Selection for accuracy

Pos1  Double

Position vector of observed object, with respect to origin at observer (or the geocenter), referred to ICRS axes, components in AU.

PosObs  Double

Position vector of observer (or the geocenter), with respect to origin at solar system barycenter, referred to ICRS axes, components in AU.

Pos2  Double

Position vector of observed object, with respect to origin at observer (or the geocenter), referred to ICRS axes, corrected for gravitational deflection, components in AU.

Return Value

               0 ... Everything OK
            < 30 ... Error from function 'Ephemeris'; 
            > 30 ... Error from function 'MakeObject'.
            

If 'Accuracy' is set to zero (full accuracy), three bodies (Sun, Jupiter, and Saturn) are used in the calculation. If the reduced-accuracy option is set, only the Sun is used in the calculation. In both cases, if the observer is not at the geocenter, the deflection due to the Earth is included.

Reference