Sets or returns the Julian date on the Terrestrial Time timescale for which the transform will be made

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


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

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 0.0, 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 particular terrestrial time Julian date is used in preference to the value derrived from the PC's clock.

Only one of JulianDateTT or JulianDateUTC needs to be set. Use whichever is more readily available, there is no need to set both values. Transform will use the last set value of either JulianDateTT or JulianDateUTC as the basis for its calculations.

See Also