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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.

A dark mountain lies in the center with an observatory building sporting two telescope domes. The background sky appears dark blue. Behind the center of the observatory is part of a crescent moon, with an unusual bright spot to its upper left. Please see the explanation for more detailed information.

Observatory Aligned with Moon Occulting Jupiter

Explanation: Sometimes we witness the Moon moving directly in front of -- called occulting -- one of the planets in our Solar System . Earlier this month that planet was Jupiter. Captured here was the moment when Jupiter re-appeared from behind the surface of our Moon. The Moon was in its third quarter , two days before the dark New Moon . Now, our Moon is continuously half lit by the Sun, but when in its third quarter, relatively little of that half can be seen from the Earth . Pictured, the Moon itself was aligned behind the famous Lick Observatory in California , USA , on the summit of Mount Hamilton . Coincidentally , Lick enabled the discovery of a moon of Jupiter: Amalthea , the last visually detected moon of Jupiter after Galileo 's observations .

Gallery: Moon Occults Jupiter in 2023 May: Notable Submissions to APOD

Date May 24, 2023
Credit Image Credit & Copyright: Rick Whitacre ; Text: Natalia Lewandowska ( SUNY Oswego )
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.