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Lunar Eclipse (2025)
Traditional names for November Moons are: Beaver Moon, Turkey Moon, Frosty Moon, Dark Moon
The Blood Beaver Moon lunar eclipse of 2021 will be the longest partial lunar eclipse in nearly 600 years. lasting 3 hours, 28 minutes and 23 seconds and visible over most of the earth. The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. This moonshadowing will take place in the predawn hours, with the visible stages ending before moonset, with the Moon sliding through the southern portion of the Earth’s dark umbra, and by mid eclipse, all but 2.6 percent of the Moon’s diameter will be immersed in the shadow. Because some of the sunlight striking the Earth is diffused and scattered by our atmosphere, the Earth’s shadow is not completely dark. Enough of this light reaches the Moon to give it a faint coppery glow. Combined with the remaining uneclipsed yellow sliver will create what some call the “Japanese Lantern Effect”. Check your local astronomer for eclipse viewing for the best timetable this November 18th and 19th. 🌘 🌑 🌒
Lunar eclipses occur when the Moon passes through the shadow of the Earth. They only occur during a full moon when the Earth is between the moon and the sun. There can be total, partial, and penumbral lunar eclipses.
Similarly, solar eclipses occur when the Earth passes through the Moon's shadow.
This umbra illusion tartan created by designer Carol A.L. Martin, uses amongst other shades of black, white, and grey, a particular shade called "eclipse."
In August 2008, the Full Moon slid across the northern edge of the umbra. Entertaining moon watchers throughout Earth's eastern hemisphere, the lunar passage created a deep but partial lunar eclipse. This composite image above uses successive pictures recorded during the eclipse from Athens, Greece to trace out a large part of the umbra's curved edge. The result nicely illustrates the relative size of the umbra's cross section at the distance of the Moon, as well as the Moon's path through the Earth's shadow.
And for spectacular moon umbra pictures taken from space during the great eclipse of 2017, click the umbra above.