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NOVAS3Bary2Obs Method
Move the origin of coordinates from the barycenter of the solar system to the observer (or the geocenter); i.e., this function accounts for parallax (annual+geocentric or justannual).

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.2.0.2774)
Syntax
public void Bary2Obs(
	double[] Pos,
	double[] PosObs,
	ref double[] Pos2,
	ref double Lighttime
)

Parameters

Pos
Type: SystemDouble
Position vector, referred to origin at solar system barycenter, components in AU.
PosObs
Type: SystemDouble
Position vector of observer (or the geocenter), with respect to origin at solar system barycenter, components in AU.
Pos2
Type: SystemDouble
Position vector, referred to origin at center of mass of the Earth, components in AU.
Lighttime
Type: SystemDouble
Light time from object to Earth in days.
Remarks