A lunar phase, or Moon phase, refers to how much of the Moon appears illuminated by the Sun as seen from Earth. The four main phases are new moon, first quarter, full moon, and last quarter. There are also four minor phases: waxing crescent, waxing gibbous, waning gibbous, and waning crescent. A lunar month, the time between the same lunar phases, is about 29.5 days long on average. The Moon's orbit is not perfectly circular, causing this variation in duration.
January 1900: Method for Calculating Lunar Phase from a Reference Date
In January 1900, a method for estimating the Moon's age and phase for any given date was formulated. It involved calculating the days elapsed since a known new moon, such as January 1900, and adjusting it based on the average length of a synodic month (approximately 29.53 days).
August 1999: Method for Calculating Lunar Phase from a Reference Date
In August 1999, a method for estimating the Moon's age and phase for any given date was formulated. It involved calculating the days elapsed since a known new moon, such as August 1999, and adjusting it based on the average length of a synodic month (approximately 29.53 days).
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