Wednesday, December 28, 2022

A Full Circle Rainbow over Norway [apod.nasa.gov]

https://apod.nasa.gov/apod/ap221227.html

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.

2022 December 27 

https://apod.nasa.gov/apod/image/2212/FullCircleRainbow_Moesch_960.jpg 

A Full Circle Rainbow over Norway
Image Credit & Copyright: Lukas Moesch

Explanation: Have you ever seen an entire rainbow? From the ground, typically, only the top portion of a rainbow is visible because directions toward the ground have fewer raindrops. From the air, though, the entire 360-degree circle of a rainbow is more commonly visible. Pictured here, a full-circle rainbow was captured over the Lofoten Islands of Norway in September by a drone passing through a rain shower. An observer-dependent phenomenon primarily caused by the internal reflection of sunlight by raindrops, the rainbow has a full diameter of 84 degrees. The Sun is in the exact opposite direction from the rainbow's center. As a bonus, a second rainbow that was more faint and color-reversed was visible outside the first.

Tomorrow's picture: open space


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