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Rare black moon Wednesday offers exceptional skygazing chance

Postby MrFredPFL » Wed Jul 31, 2019 12:41 am

Story : https://www.cnet.com/news/rare-black-moon-wednesday-july-31-offers-exceptional-s





An unusual type of supermoon is set to take the stage this week. It's called a "black supermoon," and what makes it unlike other so-called supermoons is that it's basically invisible.

The term "black moon" is an old nickname given to the second new moon in a given calendar month. If you remember your moon phases, you know a new moon occurs when the sun's light falls on the far side of the moon we don't see. It's essentially the opposite of a full moon.

The western hemisphere is getting a second new moon Wednesday, July 31 just before the calendar flips to August.

Making the celestial happening all the more intriguing is that this black moon comes when the moon is near its closest point to our planet along its orbit of Earth (the orbit is not a perfect circle). This is called perigee syzygy or more commonly, a supermoon.







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