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Earth orbits the sun, and at the same time, the moon moves in
an orbit around Earth. Sometimes Earth moves between the sun
and the moon. When this happens, Earth blocks the sunlight that
normally is reflected by the moon. (This sunlight is what causes
the moon to shine.) Instead of light hitting the moon's surface,
Earth's shadow falls on it. This is an eclipse of the moon-a lunar
eclipse. A lunar eclipse can occur only when the moon is full.
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