A lunar eclipse occurs when the Earth's shadow falls on the moon. Lunar eclipses occur, on average, about once every 6 months. Types of Lunar eclipses:
Total eclipse: When the entire moon enters the Earth's umbra (the darkest part of its shadow), this is called a total eclipse.
Partial eclipse: When only part of the moon enters the Earth's umbra, this is called a partial eclipse.
During an average total lunar eclipse, the moon is within the Earth's umbra for about an hour. This is called totality.
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