Each phase would be rotated 180° if seen looking northward from the Southern Hemisphere. The phases of the Moon as viewed looking southward from the Northern Hemisphere. Įach of the four major lunar phases is approximately 7.4 days ☑9 hours (6.58–8.24 days), the variation being due to the eccentricity of the Moon's orbit and thus it orbiting at varying speeds. The visible side of the Moon is variously sunlit, depending on the position of the Moon in its orbit, with the sunlit portion varying from 0% (at new moon) to nearly 100% (at full moon). 29.53 days) as the orbital positions of the Moon around Earth, and Earth around the Sun, shift. The lunar phases gradually change over a synodic month ( c. Shape of the Moon's directly sunlit portion as viewed from Earth The lunar phases and librations in 2023 as viewed from the Northern Hemisphere at hourly intervals, with titles and supplemental graphics The lunar phases and librations in 2023 as viewed from the Southern Hemisphere at hourly intervals, with titles and supplemental graphics A full moon sets behind San Gorgonio Mountain in California on a midsummer's morning.Ĭoncerning the lunar month of approximately 29.53 days as viewed from Earth, the lunar phase or Moon phase is the shape of the Moon's directly sunlit portion, which can be expressed quantitatively using areas or angles, or described qualitatively using the terminology of the four major phases ( new moon, first quarter, full moon, last quarter) and four minor phases (waxing crescent, waxing gibbous, waning gibbous, and waning crescent).
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