Natural History Wanderings

Earthsky reports

Depending on where you live worldwide, the new moon falls on July 31 or August 1, 2019. Same new moon … different time zones. Thus this new moon is either the second of two July 2019 new moons. Or it’s the first of two August 2019 new moons. Either way, the second of two new moons in one calendar month is sometimes called a Black Moon. Here, in the United States, the Black Moon – July’s second new moon – falls on July 31. In the world’s Eastern Hemisphere, a Black Moon falls in late August.

Source: Black Moon supermoon on July 31 | Tonight | EarthSky