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AstroUtilsMoonIllumination Method
Returns the fraction of the Moon's surface that is illuminated

Namespace: ASCOM.Astrometry.AstroUtils
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: (
public double MoonIllumination(
	double JD


Type: SystemDouble
Julian day (UTC) for which the Moon illumination is required

Return Value

Type: Double
Percentage illumination of the Moon
The algorithm used is that given in Astronomical Algorithms (Second Edition, Corrected to August 2009) Chapter 48 p345 by Jean Meeus (Willmann-Bell 1991). The Sun and Moon positions are calculated by high precision NOVAS 3.1 library using JPL DE 421 ephemeredes.
See Also