CelestialObject.GetPrimeMeridianApparentSiderealTime(TimeSpan) Method

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Description

Returns the angular difference between the true equinox of date and the body fixed reference frame X axis in the true rotation axis reference frame XY plane.

When the CelestialObject is Earth, this value is equivalent to Greenwich Apparent Sidereal Time (GAST) and also to the Greenwich Hour Angle (GHA) of the true equinox of date.

Timing Precision Mode

This page describes functionality in nanosecond timing precision mode.

Click here to see the documentation for this object in millisecond timing precision mode.

Method Signature

CelestialObject.GetPrimeMeridianApparentSiderealTime(

TimeSpan epoch)

Arguments

epoch
Description:	The epoch at which the CelestialObject's state is evaluated.

Return Value

Type:	number
Units:	deg

Returns the prime meridian apparent sidereal time.

Syntax

myVariable1 = myCelestialObject1.GetPrimeMeridianApparentSiderealTime(myTimeSpan1);