(NEXSTAR) – Just a few weeks after twin meteor showers passed overhead, there's another astronomical phenomenon set to occur – a "Black Moon."

Rising Aug. 23, the Black Moon won't be as eye-catching as other celestial events this month – in fact you won't be able to see the moon at all – but its rarity makes it fascinating, according to Space.com. While not an official astronomical term, Black Moon is used to describe "unusual timings of new moon phases."

To understand it better, it may help to think about the Blue Moon, of "Once in a Blue Moon" fame. The phrase references the rare "extra" full moon that happens every two-and-a-half years, according to NASA.

Because the moon's cycle is 29.5 days, slightly less than the average month, eventually a full moon will fall on the first or seco

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