HomeSpace NewsTomorrow's total lunar eclipse will be a rare 'selenelion'

Tomorrow’s total lunar eclipse will be a rare ‘selenelion’

Observers across the central and eastern United States and Canada should pay particular attention to the setting full moon on the morning of Nov. 8, for that morning’s lunar eclipse will still be in progress.

An interesting observation to attempt that morning would be to view the eclipsed setting moon and the rising sun simultaneously. The little-used name for this effect is called a “selenelion.”; a phenomenon that celestial geometry says cannot happen.

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