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APOD

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 tree-lined hill is shown topped by a majestic cathedral. Directly behind the cathedral is of a triangular-shaped mountain top. Directly behind the mountain is a crescent moon, although the exposure is long enough to see the rest of lunar circle. Please see the explanation for more detailed information.

Cathedral, Mountain, Moon

Explanation: Single shots like this require planning. The first step is to realize that such an amazing triple-alignment actually takes place. The second step is to find the best location to photograph it. But it was the third step: being there at exactly the right time -- and when the sky was clear -- that was the hardest. Five times over six years the photographer tried and found bad weather . Finally, just ten days ago, the weather was perfect, and a photographic dream was realized. Taken in Piemonte , Italy , the cathedral in the foreground is the Basilica of Superga , the mountain in the middle is Monviso , and, well, you know which moon is in the background. Here, even though the setting Moon was captured in a crescent phase , the exposure was long enough for doubly reflected Earthlight , called the da Vinci glow , to illuminate the entire top of the Moon .

Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)

Date December 25, 2023
Credit Image Credit & Copyright: Valerio Minato
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.