Astronomy Picture of the Day ·

A Blue-Banded Blood Moon

The Astronomy Picture of the Day for December 1, 2021 is “A Blue-Banded Blood Moon,” an image. It is credited to Image Credit: Angel Yu. The original explanation runs about 204 words.

The featured image shows the recent partial eclipse of the Moon with the eclipsed part appearing red and a blue band due to refraction of sunlight through the Earth's atmosphere. Please see the explanation for more detailed information.
Credit: Image Credit: Angel Yu Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“What causes a blue band to cross the Moon during a lunar eclipse? The blue band is real but usually quite hard to see.”

— APOD editors, December 1, 2021

Read the full explanation on science.nasa.gov

At a glance

Date
December 1, 2021
Type
Image
Credit
Credit: Image Credit: Angel Yu
Copyright
No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length
About 204 words

All of December 2021 → · 2021 by month → · Full archive since 1995 →

Topics in this entry

The MoonThe SunEclipses

Topics are matched from words in the title and explanation.

On this day: December 1 in other years

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Source

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.