Sets or return the Julian date (terrestrial time) for which the transform will be made

Namespace: ASCOM.Astrometry.Transform
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: (


double JulianDateTT { get; set; }
Visual Basic
Property JulianDateTT As Double
Visual C++
property double JulianDateTT {
	double get ();
	void set (double value);

Field Value

Julian date (terrestrial time) of the transform

Return Value

Terrestrial time Julian date that will be used by Transform or zero if the PC's current clock value will be used to calculate the Julian date.


This method was introduced in May 2012. Previously, Transform used the current date-time of the PC when calculating transforms; this remains the default behaviour for backward compatibility. The inital value of this parameter is 0 which is a special value that forces Transform to replicate original behaviour by determining the Julian date from the PC's current date and time. If this property is non zero, that terrestrial time Julian date is used in preference to the value derrived from the PC's clock.

See Also