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- Dictionarylunar eclipse
noun
- 1. an eclipse in which the moon appears darkened as it passes into the earth's shadow.
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noun
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A lunar eclipse is an astronomical event that occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. Such an alignment occurs during an eclipse season, approximately every six months, during the full moon phase, when the Moon's orbital plane is closest to the plane of the Earth's orbit. Wikipedia