NovasTer2Cel Method

public static short Ter2Cel(
	double JdHigh,
	double JdLow,
	double DeltaT,
	Method Method,
	Accuracy Accuracy,
	OutputVectorOption OutputOption,
	double xp,
	double yp,
	double[] VecT,
	ref double[] VecC
)

Public Shared Function Ter2Cel ( 
	JdHigh As Double,
	JdLow As Double,
	DeltaT As Double,
	Method As Method,
	Accuracy As Accuracy,
	OutputOption As OutputVectorOption,
	xp As Double,
	yp As Double,
	VecT As Double(),
	ByRef VecC As Double()
) As Short

Parameters

JdHigh  Double

High-order part of UT1 Julian date.

JdLow  Double

Low-order part of UT1 Julian date.

DeltaT  Double

Value of Delta T (= TT - UT1) at the input UT1 Julian date.

Method  Method

Selection for method: 0 ... CIO-based method; 1 ... equinox-based method

Accuracy  Accuracy

Selection for accuracy

OutputOption  OutputVectorOption

0 ... The output vector is referred to GCRS axes; 1 ... The output vector is produced with respect to the equator and equinox of date.

xp  Double

Conventionally-defined X coordinate of celestial intermediate pole with respect to ITRF pole, in arcseconds.

yp  Double

Conventionally-defined Y coordinate of celestial intermediate pole with respect to ITRF pole, in arcseconds.

VecT  Double

Position vector, geocentric equatorial rectangular coordinates, referred to ITRF axes (terrestrial system) in the normal case where 'option' = 0.

VecC  Double

Position vector, geocentric equatorial rectangular coordinates, referred to GCRS axes (celestial system) or with respect to the equator and equinox of date, depending on 'Option'.

Return Value

               0 ... everything is OK
               1 ... invalid value of 'Accuracy'
               2 ... invalid value of 'Method'
            > 10 ... 10 + error from function 'CioLocation'
            > 20 ... 20 + error from function 'CioBasis'
            

The 'option' flag only works for the equinox-based method.

Reference