APOD: Moon Pi and Mountain Shadow (2024 Mar 14)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 5454
Joined: Fri Dec 04, 2009 3:27 am

APOD: Moon Pi and Mountain Shadow (2024 Mar 14)

Post by APOD Robot » Thu Mar 14, 2024 4:08 am

Image Moon Pi and Mountain Shadow

Explanation: What phase of the Moon is 3.14 radians from the Sun? The Full Moon, of course. Even though the Moon might look full for several days, the Moon is truly at its full phase when it is Pi radians (aka 180 degrees) from the Sun in ecliptic longitude. That's opposite the Sun in planet Earth's sky. Rising as the Sun set on March 9, 2020, only an hour or so after the moment of its full phase, this orange tinted and slightly flattened Moon still looked full. It was photographed opposite the setting Sun from Teide National Park on the Canary Island of Tenerife. Also opposite the setting Sun, seen from near the Teide volcano peak about 3,500 meters above sea level, is the mountain's rising triangular shadow extending into Earth's dense atmosphere. Below the distant ridge line on the left are the white telescope domes of Teide Observatory. Again Pi radians from the Sun, on March 25 the Full Moon will dim slightly as it glides through Earth's outer shadow in a penumbral lunar eclipse.

<< Previous APOD This Day in APOD Next APOD >>

User avatar
Case
Commander
Posts: 617
Joined: Sat Jun 09, 2007 10:08 pm
Location: (52°N, 06°E)

Re: APOD: Moon Pi and Mountain Shadow (2024 Mar 14)

Post by Case » Thu Mar 14, 2024 8:15 am