Our Moon's appearance changes nightly. As the Moon orbits the Earth , the half illuminated by the Sun first becomes increasingly visible, then decreasingly visible. The Moon always keeps the same face toward the Earth. The Moon 's apparent size changes slightly, though, and a slight wobble called a libration is discernable as it progresses along its elliptical orbit . During the cycle , sunlight reflects from the Moon at different angles, and so illuminates different features differently.
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