May 31 brings a Blue Micromoon — the smallest full moon of 2026
On May 31 at 08:45 UTC, the Moon reaches full phase for the second time this month. That second-in-a-month qualifier makes it a Blue Moon by the modern calendar definition. It also happens to sit near apogee — 406,135 km from Earth — making it a Micromoon: roughly 5.5% smaller in angular diameter and about 10% dimmer than an average full moon. It’s the most distant full moon of 2026. And if you walk outside that night expecting something visibly unusual, you’ll be disappointed. ...