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Saturday’s Lunar Eclipse Will Include ‘Impossible’ Sight
This year’s second total lunar eclipse on Saturday (Dec. 10) will offer a rare chance to see a strange celestial sight traditionally thought impossible. For most places in the United States and Canada, there will be a chance to observe an unusual effect, one that celestial geometry seems to dictate can’t happen. The little-used name for this effect is a “selenelion” (or “selenehelion”) and occurs when both the sun and the eclipsed moon can be seen at the same time.
