The Full Blue Moon in Sagittarius arrives on May 31, 2026, at 4:45 a.m. Eastern Time, making it the second Full Moon of May 2026. That is what makes it a Blue Moon — not because the Moon will literally turn blue, but because two Full Moons are happening within one calendar month. And when a Full Moon lands in Sagittarius, the energy gets big, honest, kind of restless, and truth-seeking. Sagittarius is the sign of wisdom, freedom, philosophy, travel, expansion, and the kind of