The moon goes by many names. August saw the full sturgeon moon while in March sky-gazers may have witnessed the blood moon , which occurs when the satellite appears to turn red during a lunar eclipse. You may have also heard of a blue moon, the second full moon to happen in one month.

And then there is the black moon, occurring this weekend, which is rare — and invisible.

This phenomenon will occur Friday night into the early hours of Saturday. The moon will be closest to the sun at 2:06 a.m. ET Saturday, according to EarthSky .

What is a black moon?

Like a blue moon, a black moon isn’t an official term, but it refers to the second new moon in a month . It happens once every 29 months.

A new moon occurs when only its far side is illuminated by the sun, making it invisible from E

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