A Supermoon Blue Moon rose over the Longquan Mountain Observation Deck in Chengdu, Sichuan Province, China, on August 19, 2024. This event, occurring at 2:26 p.m. EDT, showcased a fully illuminated moon. A seasonal Blue Moon, it was the third full moon in a four-full-moon season. A supermoon happens when the moon is within 90% of its closest approach to Earth. August’s full moon will be followed by three more supermoons in September.