The moon is half lit up tonight, which means a lot of things. Namely, we’re in a new lunar cycle.
The lunar cycle is a series of eight unique phases of the moon’s visibility. The whole cycle takes about 29.5 days, according to NASA, and these different phases happen as the Sun lights up different parts of the moon whilst it orbits Earth.
So, what’s happening with the moon tonight, Aug. 16?
What is today’s moon phase?
As of Saturday, Aug. 16, the moon phase is Third Quarter (also known as the Last Quarter) and it is 46% lit up to us on Earth, according to NASA’s Daily Moon Observation.
From this point onwards, the moon will be less and less visible, as we’re now on day 23 of the lunar cycle. But there’s still plenty to spot on the moon’s surface, if you look hard enough. With your naked eye, catch a glimpse of the Aristarchus Plateau, the Tycho Crater, and the Copernicus Crater.
With binoculars, see even more, including the Archimedes Crater, Alphonsus Crater, and the Clavius Crater. If you have a telescope, look out for the Apollo 12, Reiner Gamma, and the Schiller Crater, too.
When is the next full moon?
The next full moon will be on Sept. 7. The last full moon was on Aug. 9.
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What are moon phases?
According to NASA, moon phases are caused by the 29.5-day cycle of the moon’s orbit, which changes the angles between the Sun, Moon, and Earth. Moon phases are how the moon looks from Earth as it goes around us. We always see the same side of the moon, but how much of it is lit up by the Sun changes depending on where it is in its orbit. This is how we get full moons, half moons, and moons that appear completely invisible. There are eight main moon phases, and they follow a repeating cycle:
New Moon – The moon is between Earth and the sun, so the side we see is dark (in other words, it’s invisible to the eye).
Waxing Crescent – A small sliver of light appears on the right side (Northern Hemisphere).
First Quarter – Half of the moon is lit on the right side. It looks like a half-moon.
Waxing Gibbous – More than half is lit up, but it’s not quite full yet.
Full Moon – The whole face of the moon is illuminated and fully visible.
Waning Gibbous – The moon starts losing light on the right side.
Last Quarter (or Third Quarter) – Another half-moon, but now the left side is lit.
Waning Crescent – A thin sliver of light remains on the left side before going dark again.
