For those looking up at the sky tonight in North America, you may notice something missing—the moon! That’s because July 31 marks a lunar event called the “black moon” which is the second new moon that happens in one calendar month. A new moon is the phase of the moon where it’s invisible, with the lit portion of the moon facing away from us.
Source:
https://phys.org/news/2019-07-black-moon-event-bridges-fiction.html