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The lunar phase or phase of the moon is the shape of the illuminated (sunlit) portion of the Moon as seen by an observer on Earth. The lunar phases change cyclically as the Moon orbits the Earth, according to the changing positions of the Moon and Sun relative to the Earth. The Moon and the Earth are tidally locked, therefore the same lunar surface always faces Earth. This face is variously sunlit depending on the position of the Moon in its orbit.
Waxing. The waxing moon is the lunar phase, starting when the moon is just passed its darkest, and continues until the moon is at its brightest. When the moon is waxing, a sliver more can be viewed each night, and it appears to be growing. Waning. The waning moon is the lunar phase, beginning when the moon is just passed its brightest and fullest, and continues until the moon can no longer be easily viewed.