April 1921 lunar eclipse
| Total eclipse | |||||||||||||||||
The Moon's hourly motion shown right to left | |||||||||||||||||
| Date | April 22, 1921 | ||||||||||||||||
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| Gamma | 0.4269 | ||||||||||||||||
| Magnitude | 1.0678 | ||||||||||||||||
| Saros cycle | 130 (29 of 72) | ||||||||||||||||
| Totality | 40 minutes, 7 seconds | ||||||||||||||||
| Partiality | 202 minutes, 2 seconds | ||||||||||||||||
| Penumbral | 331 minutes, 54 seconds | ||||||||||||||||
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A total lunar eclipse occurred at the Moon’s ascending node of orbit on Friday, April 22, 1921, with an umbral magnitude of 1.0678. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. 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. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's shadow is smaller. Occurring only about 5.6 days after perigee (on April 16, 1921, at 16:10 UTC), the Moon's apparent diameter was larger.
This lunar eclipse was the third of an almost tetrad, with the others being on May 3, 1920 (total); October 27, 1920 (total); and October 16, 1921 (partial).
This was the first total lunar eclipse of Lunar Saros 130.