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NOVAS31Wobble Method
Corrects a vector in the ITRF (rotating Earth-fixed system) for polar motion, and also corrects the longitude origin (by a tiny amount) to the Terrestrial Intermediate Origin (TIO).

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.3.0.2839)
Syntax
public void Wobble(
	double Tjd,
	TransformationDirection Direction,
	double xp,
	double yp,
	double[] Pos1,
	ref double[] Pos2
)

Parameters

Tjd
Type: SystemDouble
TT or UT1 Julian date.
Direction
Type: ASCOM.AstrometryTransformationDirection
Flag determining 'direction' of transformation; direction = 0 transformation applied, ITRS to terrestrial intermediate system direction != 0 inverse transformation applied, terrestrial intermediate system to ITRS
xp
Type: SystemDouble
Conventionally-defined X coordinate of Celestial Intermediate Pole with respect to ITRF pole, in arcseconds.
yp
Type: SystemDouble
Conventionally-defined Y coordinate of Celestial Intermediate Pole with respect to ITRF pole, in arcseconds.
Pos1
Type: SystemDouble
Position vector, geocentric equatorial rectangular coordinates, referred to ITRF axes.
Pos2
Type: SystemDouble
Position vector, geocentric equatorial rectangular coordinates, referred to true equator and TIO.
Remarks