Moon phase today: What the moon will look like on August 18, 2025
The moon is looking a little darker right now due to where we are in the lunar cycle, 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 let's see what's happening with the moon tonight, Aug. 18.
What is today's moon phase?
As of Monday, Aug. 18, the moon phase is Waning Crescent, and it is 25% lit up to us on Earth, according to NASA's Daily Moon Observation.
We're on day 25 of the lunar cycle, so it's really close to the New Moon. There's not much moon on display, but there are a few things we can still look out for. With no visual aids other than your eyes, try and spot the Oceanus Procellarum and the Kepler Crater. These are positioned in the top left of the moon (bottom right, if you're in the Southern Hemisphere).
With binoculars, see even more, including the Grimaldi Basin and the Mare Humorum, and with a telescope, enjoy a glimpse of the 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.
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.
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