A very rare lunar eclipse occurred during the early hours of 21 December 2010.It is the first time a full lunar eclipse has occurred during winter solstice since
1638 and the next one will occur in 2094.
A lunar eclipse happens when the sun, Earth, and moon align--with the Earth in the middle. By virtue of that placement, there is always a full moon during a lunar eclipse. Unlike a solar eclipse, a lunar eclipse is viewable for quite some time and is safe to view.
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Despite being in shadow, the Moon did not become invisible, as there was still residual light deflected towards it by our atmosphere.
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