Credit & Copyright: Elias ChasiotisExplanation: Why is a thin crescent moon never seen far from a horizon? Because the only geometry that gives a thin crescent lunar phase occurs when the Moon appears close to the Sun in the sky. The crescent is not caused by the shadow of the Earth, but by seeing only a small part of the Moon directly illuminated by the Sun. Moreover, the thickest part of the crescent always occurs in the direction of the Sun. In the evening, a thin crescent Moon will set shortly after the Sun and not be seen for the rest of the night. Alternatively, in the morning, a crescent Moon will rise shortly before the Sun after not being seen for most of the night. Pictured two weeks ago, a crescent moon was captured near the horizon, just before sunrise, far behind remnants of the ancient Temple of Poseidon in Greece.
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A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture Of the Day
Publications with keywords: Moon
Publications with words: Moon
- APOD: 2023 September 17 Á Moon Mountains Magnified during Ring of Fire Eclipse
- APOD: 2023 September 5 Á Blue Supermoon Beyond Syracuse
- APOD: 2023 June 12 Á The Largest Satellites of Earth
- APOD: 2023 May 24 Á Observatory Aligned with Moon Occulting Jupiter
- Shackleton from ShadowCam
- APOD: 2023 April 26 Á The Moon through the Arc de Triomphe
- Crescent Moon Occultation