Moon phase today: What the moon will look like on September 17
We're nearing the end of the current lunar cycle, with the New Moon just days away. The lunar cycle is a 29.5-day series of eight unique phases of the moon's visibility. Right now, we're on day 25. According to NASA, 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, Sept. 17.
What is today’s moon phase?
As of Wednesday, Sept. 17, the moon phase is Waning Crescent, and it is 18% lit up to us on Earth, according to NASA's Daily Moon Observation.
Visibility is low right now, due to the percentage of the moon that is lit up, but you can still see various features on the moon's surface. With no visual aids, you can still catch a glimpse of the Aristarchus Plateau and Kepler Crater. If you have binoculars, you'll also see the Grimaldi Basin and the Gassendi Crater. With a telescope, add the Reiner Gamma to your list of things to spot.
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When is the next full moon?
The next full moon will be on Oct. 6. The last full moon was on Sept. 7.
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.
Lois Mackenzie is a freelance reporter at Mashable. Over the years she has written for many publications, covering everything from the local news to the best pair of running shoes. You can find bylines in publications including Fit&Well, Metro, and Coach magazine, usually covering deals on everything from earbuds to TVs, or guides on how to beat your half marathon time.
Lois also holds a Master's degree in Digital Journalism from Strathclyde University and obtained a Master of Arts in English Literature at the University of Aberdeen.
