Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2023 October 29
Two images of a partial lunar eclipse are shown. On the left
the image is overexposed everywhere except the bottom right where
the eclipsed part of the Moon is visible. On the right image most
of the image is normally exposed but the bottom right part is dark.
Please see the explanation for more detailed information.

A Partial Lunar Eclipse
Image Credit & Copyright: Orazio Mezzio

Explanation: What's happened to the Moon? Within the last day, part of the Moon moved through the Earth's shadow. This happens about once or twice a year, but not every month since the Moon's orbit around the Earth is slightly tilted. Pictured here, the face of a full Hunter's Moon is shown twice from Italy during this partial lunar eclipse. On the left, most of the Moon appears overexposed except for the eclipsed bottom right, which shows some familiar lunar surface details. In contrast, on the right, most of the (same) Moon appears normally exposed, with the exception of the bottom right, which now appears dark. All lunar eclipses are visible from the half of the Earth facing the Moon at the time of the eclipse, but this eclipse was visible specifically from Europe, Africa, Asia, and Australia, clouds permitting. In April, a total solar eclipse will be visible from North America.

Album: Selected partial lunar eclipse images sent in to APOD
Tomorrow's picture: ghostly reflections

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