A lunar eclipse occurs when the Earth's shadow falls on the moon. Lunar eclipses occur, on average, about every 6 months.
月食的发生,是由于地球的影子落在月球上。月食发生的频率平均是6个月一次。
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The astronomers, at Spain's Institute of Astrophysics of the Canary Islands, made their observations on 16 August 2008 during a lunar eclipse — in which the Moon moves into Earth's shadow.