November 2021 lunar eclipse
| Partial eclipse | |||||||||||||
Partiality as viewed from Starkville, Mississippi at maximum, 9:03 UTC | |||||||||||||
| Date | November 19, 2021 | ||||||||||||
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| Gamma | −0.4552 | ||||||||||||
| Magnitude | 0.9760 | ||||||||||||
| Saros cycle | 126 (46 of 72) | ||||||||||||
| Partiality | 208 minutes, 23 seconds | ||||||||||||
| Penumbral | 361 minutes, 29 seconds | ||||||||||||
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A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Friday, November 19, 2021, with an umbral magnitude of 0.9760. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring only about 12 hours before apogee (on November 20, 2021, at 21:10 UTC), the Moon's apparent diameter was smaller.
This was the longest partial lunar eclipse since February 18, 1440, and the longest until February 8, 2669; however, many eclipses, including the November 2022 lunar eclipse, have a longer period of umbral contact at next to 3 hours 40 minutes. It was often referred to as a "Beaver Blood Moon" although not technically fulfilling the criteria for a true blood moon (totality).
This lunar eclipse was the second of an almost tetrad, with the others being on May 26, 2021 (total); May 16, 2022 (total); and November 8, 2022 (total).