NovasCelPole Method

This function allows for the specification of celestial pole offsets for high-precision applications. Each set of offsets is a correction to the modeled position of the pole for a specific date, derived from observations and published by the IERS.

Definition

Namespace: ASCOM.Tools.Novas31
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea

C#

public static short CelPole(
	double Tjd,
	PoleOffsetCorrection Type,
	double Dpole1,
	double Dpole2
)

VB

Public Shared Function CelPole ( 
	Tjd As Double,
	Type As PoleOffsetCorrection,
	Dpole1 As Double,
	Dpole2 As Double
) As Short

Parameters

Tjd Double: TDB or TT Julian date for pole offsets.
Type PoleOffsetCorrection: Type of pole offset. 1 for corrections to angular coordinates of modeled pole referred to mean ecliptic of date, that is, delta-delta-psi and delta-delta-epsilon. 2 for corrections to components of modeled pole unit vector referred to GCRS axes, that is, dx and dy.
Dpole1 Double: Value of celestial pole offset in first coordinate, (delta-delta-psi or dx) in milli-arcseconds.
Dpole2 Double: Value of celestial pole offset in second coordinate, (delta-delta-epsilon or dy) in milli-arcseconds.

Return Value

Int16

            0 ... Everything OK
            1 ... Invalid value of 'Type'.

Version Information

.NET Standard

Supported in: 2.0