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Prior to the occurrence of a penumbral lunar eclipse on 10 February 2017, a number of news outlets ran headlines suggesting that this celestial event would be even more rare because viewers would get to experience three events at the same time: A full moon, a lunar eclipse, and a comet (viewable with binoculars). The Washington Post, for example, ran with the following headline and lede: USA Today's reporting took a similar tack: While the close approach of a comet during an eclipse is rare, the presence of a full moon during an eclipse is required. The orbital arrangement of the sun, earth, and moon necessary for an eclipse to occur only happens during a full moon, as explained by the European Space Agency:
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