Overview

• The event occurs on August 23 during a summer that includes new moons on June 25, July 23, August 23 and September 21.
• The term has no official astronomical definition, with usages ranging from an extra seasonal new moon to a second new moon within a single calendar month.
• Like any new moon, it will not be visible because the Moon lies between Earth and the Sun and its Earth-facing side is unlit.
• Coverage characterizes the occurrence as rare at about every 33 months, with the previous instance on May 19, 2023 and the next anticipated in 2027.
• For a visible highlight, observers can prepare for a total lunar eclipse on September 7 when a full Moon will traverse Earth's shadow.