The August 23, 2025 Black Moon is a seasonal Black Moon, the third new moon of summer in a season that contains four new moons (June 25, July 24, Aug. 23, and
Peak illumination occurs on Saturday, August 9, 2025 at 3:55 a.m. EDT (07:55 GMT), with the Moon opposite the Sun in Capricornus near Deneb Algedi and fully illuminated toward Earth. The full