Phases of moon...........
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The lunar phase or Moon phase is the shape of the Moon's directly sunlit portion as viewed from Earth. The lunar phases gradually change over a synodic month as the Moon's orbital positions around Earth and Earth around the Sun shift.
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There are four principal lunar phases: the new moon, first quarter, full moon, and last quarter (also known as a third or final quarter), when the Moon's ecliptic longitude is at an angle to the Sun (as viewed from Earth) of 0°, 90°, 180°, and 270°, respectively.[a] Each of these phases appears at slightly different times at different locations on Earth.
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