Click or drag to resize
NOVAS31CioLocation Method
Returns the location of the celestial intermediate origin (CIO) for a given Julian date, as a right ascension

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.2.0.2774)
Syntax
public short CioLocation(
	double JdTdb,
	Accuracy Accuracy,
	ref double RaCio,
	ref ReferenceSystem RefSys
)

Parameters

JdTdb
Type: SystemDouble
TDB Julian date.
Accuracy
Type: ASCOM.AstrometryAccuracy
Selection for accuracy
RaCio
Type: SystemDouble
Right ascension of the CIO, in hours.
RefSys
Type: ASCOM.AstrometryReferenceSystem
Reference system in which right ascension is given

Return Value

Type: Int16
    0 ... everything OK
    1 ... unable to allocate memory for the 'cio' array
 > 10 ... 10 + the error code from function 'CioArray'.
 
Remarks
This function returns the location of the celestial intermediate origin (CIO) for a given Julian date, as a right ascension with respect to either the GCRS (geocentric ICRS) origin or the true equinox of date. The CIO is always located on the true equator (= intermediate equator) of date.
See Also