TechnologyWatch the full moon dance over one year in...

Watch the full moon dance over one year in stunning time-lapse video by photographer

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The full moon as seen from the International Space Station on Dec, 20, 2021.

The full moon as it it appeared from the International Space Station in December 2021. A ground-based astrophotographer has captured astunning time-lapse of the dancing full moon over a full year.
(Image credit: NASA)

The full moon can be a stunning sight in the night sky, but did you know it can dance?

A new time-lapse video from astrophotographer Andrew McCarthy has shown just that, the full moon appearing to dance around in the sky during one entire year. There’s no tricks involved, just the moon wobbling in its orbit around the Earth, McCarthy wrote on Reddit (opens in new tab), where he shared the video as an animation on July 24. 

“The perceived wobble of the moon is called ‘libration’ and is the result of the moon’s not-quite circular orbit,” McCarthy wrote (opens in new tab). “The rotation is due in part to the moon’s orbit being at an angle to the ecliptic, as well as Earth’s axial tilt.”

McCarthy snapped a photo of the full or nearly full moon from Arizona each month for a year when it was highest in the sky instead of when it was exactly full in order to accurately capture the lunar libration. He also worked to preserve the scale of the moon so it would appear the same size across the video.

Related: Amazing Buck Moon 2022 supermoon photos by stargazers

McCarthy has also created a video of the moon’s changes during a single lunar month, which he shared on Instagram. That video is made up of “2 million photos of the moon over 26 days to see how it danced,” McCarthy wrote in that post (opens in new tab) from March 9.

In his Reddit post, McCarthy said he’s photographed nearly every full moon for the last three years. You can see more examples of his amazing night sky photography on his Instagram page (opens in new tab), where he posts as Cosmic Background. McCarthy also has a professional Cosmic Background website (opens in new tab) where you can order prints of his astrophotography.

McCarthy’s moon libration video animation offers a stunning look at how the moon changes over time from month to month in its orbit. On average, the distance from the Earth to the moon is about 238,855 miles (384,400 kilometers). Since the moon’s orbit is not a perfect circle, there are places in the orbit where it is closest to the Earth and others where it is farther away. 

At perigee, the moon is at its closest to the Earth for the month, a distance of about  226,000 miles (363,300 km). The moon is farthest away when it reaches apogee, which is about 251,000 miles (405,500 km) from the Earth. The moon is also currently drifting away from the Earth at a rate of about 1.5 inches (3.8 centimeters) a year. 

Our detailed guide to observing the moon can also help you map out your next photo session of the Earth’s lunar neighbor. If you’re looking for a telescope or binoculars to observe the moon, our guides for the best binoculars deals and the best telescope deals now are a great place to start. Our best cameras for astrophotography and best lenses for astrophotography have helpful tips on the gear you’ll need to capture the next skywatching sight on your own. 

Email Tariq Malik at tmalik@space.com (opens in new tab) or follow him @tariqjmalik (opens in new tab). Follow us @Spacedotcom (opens in new tab)Facebook (opens in new tab) and Instagram (opens in new tab).

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community@space.com.

Tariq Malik

Tariq is the Editor-in-Chief of Space.com and joined the team in 2001, first as an intern and staff writer, and later as an editor. He covers human spaceflight, exploration and space science, as well as skywatching and entertainment. He became Space.com’s Managing Editor in 2009 and Editor-in-Chief in 2019. Before joining Space.com, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. To see his latest project, you can follow Tariq on Twitter.

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