With each day we move through the lunar cycle, the moon becomes less and less visible.
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. 13?
What is today’s moon phase?
As of Wednesday, Aug. 13, the moon phase is Waning Gibbous, and it is 79% lit up to us on Earth, according to NASA’s Daily Moon Observation.
Tonight is the second night of the Perseids Meteor Shower peak. The moonlight may dim some of the meteors, but some should still cut through the light as the celestial event flashes through our skies.
Alongside this, with no visual aids on the moon, you can spot the Tycho Crater, Mare Serenitatis, and the Oceanus Procellarum, an “Ocean of Storms” that covers more than 10% of the moon’s surface.
With binoculars, you can add the Clavius Crater, Alphonsus Crater, and the Mare Frigoris to your list. And add a telescope to see the Apollo 11, the Rima Ariadaeus, and the Linne Crater.
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When is the next full moon?
The next full moon will be on Sept. 7. The last full moon was on Aug. 9.
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.
