A rare lunar event known as a Black Moon is set to occur on August 23, though it won’t be visible in the sky due to its timing. The term “Black Moon” refers to an unusual new moon phase that occurs when there are four new moons in a single season.
This week’s event falls under the seasonal definition of a Black Moon, which happens about once every 33 months. The last seasonal Black Moon occurred on May 19, 2023. During this phase, the moon is positioned between Earth and the sun, making it invisible against the bright sky.
However, don’t be disappointed as the days following the Black Moon will reveal a beautiful lunar sight: the thinnest crescent. On August 24 and 25, look towards the western horizon about 30 to 40 minutes after sunset to spot a delicate silver arc.
The dark moonless skies surrounding a new moon are also perfect for observing fainter deep sky objects that would otherwise be difficult to see during brighter moon phases. It’s an ideal time to study the dense core of the Milky Way.
A Black Moon isn’t an official astronomical term, but it describes unusual lunar events like this one. Unlike supermoons or lunar eclipses, a Black Moon can’t be watched in real-time as it occurs when the moon is positioned between Earth and the sun.
Source: https://www.space.com/stargazing/a-rare-black-moon-rises-with-the-sun-on-aug-23-2025-heres-what-to-expect