In astrology, a Moon Phase describes the angular relationship between the Sun and Moon at the time represented by a natal chart. The familiar lunar phases, such as New Moon, First Quarter, Full Moon, and Last Quarter, arise from different positions of the Moon relative to the Sun. Astrologers may consider the natal Moon phase as an additional layer of chart interpretation, using it to explore broader patterns of orientation, expression, development, and response. The Moon phase is not a separate chart factor but a relationship derived from the positions of the Sun and Moon.