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. 
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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 Earth. It marks the beginning of the lunar cycle. 
 
“A black moon (or new moon) is when the moon is basically in between the Earth and the sun, not to make an eclipse, but where we don’t see the moon,” said Noah Petro, chief of NASA’s Planetary, Geology, Geophysics and Geochemistry Laboratory at Goddard Space Flight Center in Greenbelt, Maryland. 
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What makes it different from a solar eclipse is the placement of the moon. In a solar eclipse, the moon passes in front of the sun, blocking some or all the sunlight and casting a shadow on Earth. But a new moon (and black moon) passes near the sun. 
 
The term black moon can also refer to a month in which there are no new moons. This typically happens in February because the lunar cycle follows a pattern of 29.5 days, according to Petro. February usually has 28 days, except on leap years when it has 29 days. 
 
Stargazers may have quite a view 
Since the black moon will be invisible, moon watchers won’t have much to see. 
 
But stargazers will have plenty. 
 
“A new moon or the black moon is great for astronomers when it’s clear,” Petro said, “because you can go outside and have basically no light contamination from the moon.” 
 
This is the best time of year to see planets, according to EarthSky, so after sunset or just before sunrise, you might be able to spot some celestial bodies, such as Venus, Mars and Saturn. 
 
If you have binoculars or a telescope, you can also keep an eye out for the dumbbell nebula, the colorful, glowing remnants of an old star 1,200 light-years from Earth in the Vulpecula constellation. The nebula appears during the first half of the night.