The earth casts a long shadow into space, and when this shadow passes over the moon it causes an Eclipse. A Lunar Eclipse can only happen during a full moon, when the sun is directly behind the earth. It happens only occasionally, because the orbit of the moon is slightly tilted and so the shadow misses it. Lunar eclipses can last for over 1 hour, but they do not completely black out the shadowed part of the moon. Some sunlight always filters through, making the shadow look a reddish-brown colour.
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