Calculates the illumination of the moon.
The angle of the moon illumination relative to earth. The moon is waxing if the angle is negative, and waning if positive.
The closest LunarPhase to the LunarIllumination's angle.
Illuminated fraction. 0.0 indicates new moon, 1.0 indicates full moon.
0.0
1.0
Moon phase. Starts at -180.0 (new moon, waxing), passes 0.0 (full moon) and moves toward 180.0 (waning, new moon).
-180.0
180.0