Astro*Dictionary
by Michael Erlewine

2 articles for
"Quarter Moon"

The phase which occurs when the excess of the Moon's apparent longitude over the Sun's apparent longitude is either 90° (first quarter), or 270° (last quarter). Although close, this is not precisely at the same moment of time when the visible disk of the Moon is half-illuminated.

 

See also: ♦ Lunar Phases

The phase of the Moon in a given chart.

 

See also: ♦ Lunar Phases