The second full moon of May rises this weekend as a rare Blue Apogee Micromoon, and skywatchers who know exactly when and where to look will catch a celestial event that won't return for at least 27 years.
The full moon reaches peak illumination at 4:45 a.m. ET (8:45 a.m. UTC) on Sunday, 31 May. But the predawn peak isn't the ideal viewing window for most people. The best time to step outside is actually Saturday, 30 May evening, shortly after moonrise, when the moon sits low on the eastern horizon and takes on a warm golden-orange glow.
