Blue Moon
A second full Moon in the same calendar month.
When and how to watch
The second full moon in a single calendar month
Moon on Sun, May 31, 2026
Lunar 4/15
The Moon on this date is Full Moon, with about 100% of its disk illuminated.
Illumination
100%
Moonrise
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Moonset
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Moonrise and moonset use your selected observation location.
It rises near sunset and crosses the sky through the night at its fullest illumination.