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Wed Jul 31, 2019, 01:47 AM

Black Moon 2019: What It Is (and Why You Can't See It)


By Joe Rao 12 hours ago



The Black Moon arrives on Wednesday, July 31. (Image: ę NASA)

While a full moon refers to the moment when the moon's Earth-facing side is fully illuminated by sunlight, a new moon refers to the moment when the moon's Earth-facing side is fully in shadow. (Unfortunately, that means the Black Moon will be more or less invisible, even if the moon is high in the sky).

The lunar calendar almost lines up with Earth's calendar year, so there is typically one full moon and one new moon each month. A second full moon in a single calendar month is sometimes called a "Blue Moon." A Black Moon is supposedly the flip side of a Blue Moon: the second new moon in a single calendar month. The next Black Moon takes place on July 31 (in the Western Hemisphere).

The Black Moon is a somewhat unusual celestial event Ś they occur about once every 32 months, and they sometimes only occur in certain time zones.

From most of the Western Hemisphere, the new moon occurring on Wednesday, July 31 is a Black Moon. Officially, it occurs at 11:13 p.m. EDT (0313 GMT on Aug. 1).

More:
https://www.space.com//34162-black-moon-guide.html?utm_source=notification

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