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NOVAS3CioRa Method
Computes the true right ascension of the celestial intermediate origin (CIO) at a given TT Julian date. This is -(equation of the origins).

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.2.0.2774)
Syntax
public short CioRa(
	double JdTt,
	Accuracy Accuracy,
	ref double RaCio
)

Parameters

JdTt
Type: SystemDouble
TT Julian date
Accuracy
Type: ASCOM.AstrometryAccuracy
Selection for accuracy
RaCio
Type: SystemDouble
Right ascension of the CIO, with respect to the true equinox of date, in hours (+ or -).

Return Value

Type: Int16
   0  ... everything OK
   1  ... invalid value of 'Accuracy'
 > 10 ... 10 + the error code from function 'CioLocation'
 > 20 ... 20 + the error code from function 'CioBasis'.
 
Remarks