noun
A rare astronomical event in which a lunar eclipse and a sunrise or sunset can be seen simultaneously
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A selenelion occurs when both the sun and the eclipsed moon can be seen at the same time.
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Did you see the selenelion last night? It was so cool!
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I heard there was a selenelion happening, but I missed it.
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Experiencing a selenelion is like witnessing a rare celestial event that only happens once in a blue moon.