ASCOM Library
TransformJulian
Sets or returns the Julian date on the Terrestrial Time timescale for which the transform will be made
Definition
Namespace: ASCOM.Tools
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea
Julian date (Terrestrial Time) of the transform (1757583.5 to 5373484.499999 = 00:00:00 1/1/0100 to 23:59:59.999 31/12/9999)
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.
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea
C#
public double JulianDateTT { get; set; }VB
Public Property JulianDateTT As Double
Get
SetProperty Value
DoubleJulian date (Terrestrial Time) of the transform (1757583.5 to 5373484.499999 = 00:00:00 1/1/0100 to 23:59:59.999 31/12/9999)
Return Value
DoubleTerrestrial 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.
Remarks
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 initial 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 derived 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.