A partial lunar eclipse occurred on 19 November 2021. The eclipse occurred towards a micromoon.[2] This was the longest partial lunar eclipse since 18 February 1440, and the longest until 8 February, 2669; however, many eclipses, including the November 2022 lunar eclipse, have a longer period of umbral contact at next to 3 hours 40 minutes.[3] 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, the others being 26 May 2021 (T), 16 May 2022 (T) and 08 Nov 2022 (T).
In northern and western Europe and the westernmost parts of Africa, the first phase of the eclipse was visible, as the Moon set below the horizon on the morning of Friday, 19 November 2021. The fullest extent of the lunar eclipse was visible over North and South America after midnight on Friday, with the event beginning in the latest hours of Thursday night over parts of Alaska and Hawaii. The entirety of the eclipse, from one side of the Earth's shadow to the other, occurred with the Moon visible above the horizon in nearly all of North America.[4]
In the Eastern Hemisphere, as the partially-eclipsed Moon began to rise at dusk, the eclipse became visible across the Pacific Ocean, Australia, and much of Asia. At places in extreme northern latitudes and areas in northern and eastern Russia, such as Kamchatka, the Moon was already visible by the time the eclipse began on Friday (and the eclipse ended just near Saturday midnight). There was little or no visibility for most of Africa, eastern Europe, and western or southern parts of Asia, including the Middle East and much of the Indian subcontinent.[5]
The tritos series repeats 31 days short of 11 years at alternating nodes. Sequential events have incremental Saros cycle indices.
This series produces 20 total eclipses between April 24, 1967 and August 11, 2185, only being partial on November 19, 2021.
It is part of saros series 126.
Lunar saros series 126, repeating every 18 years and 11 days, has a total of 70 lunar eclipse events including 14 total lunar eclipses. Solar Saros 133 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.
First penumbral lunar eclipse: 18 July 1228
First partial lunar eclipse: 24 March 1625
First total lunar eclipse: 19 June 1769
First central lunar eclipse: 11 July 1805
Greatest eclipse of the lunar saros 126: 13 August 1859, lasting 106 minutes.
Last central lunar eclipse: 26 September 1931
Last total lunar eclipse: 9 November 2003
Last partial lunar eclipse: 5 June 2346
Last penumbral lunar eclipse: 19 August 2472
1901-2100
19 November 2021
11 December 2057
22 December 2075
1 January 2094
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[6] This lunar eclipse is related to two total solar eclipses of Solar Saros 133.
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