Blue Moon
May 31, 2026 — Blue Moon
A full moon occurs when Earth sits directly between the Sun and the Moon, so the entire lunar disc facing us is lit. It rises at sunset, climbs highest around midnight, and sets at sunrise — visible all night from everywhere on Earth. There are 12 or 13 full moons each year; a 13th is called a blue moon. When the Moon is near its closest point to Earth — perigee — it appears up to 14% larger and 30% brighter, a supermoon. Each full moon has a traditional name drawn from Native American, Colonial American, and European folklore, tied to the season.