May 2026 has two full moons, with the second occurring in the early morning hours of Sunday, May 31. Illumination peaks at 4:45 a.m. ET. The blue moon definition includes either a second full moon in the same calendar month or an extra full moon within an astronomical season. The next seasonal blue moon is May 20, 2027, while the next calendar blue moon is December 2028. A micromoon appears about 10% to 15% smaller in diameter and slightly dimmer due to the Moon’s elliptical orbit, occurring near apogee.
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