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    • Source: April 1921 lunar eclipse

      • 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.


      Visibility


      The eclipse was completely visible over much of North America and western South America, seen rising over northeast Asia and Australia and setting over eastern South America, western Europe, and west Africa.


      Eclipse details


      Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.


      Eclipse season



      This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.


      Related eclipses




      = Eclipses in 1921

      =
      An annular solar eclipse on April 8.
      A total lunar eclipse on April 22.
      A total solar eclipse on October 1.
      A partial lunar eclipse on October 16.


      = Metonic

      =
      Preceded by: Lunar eclipse of July 4, 1917
      Followed by: Lunar eclipse of February 8, 1925


      = Tzolkinex

      =
      Preceded by: Lunar eclipse of March 12, 1914
      Followed by: Lunar eclipse of June 3, 1928


      = Half-Saros

      =
      Preceded by: Solar eclipse of April 17, 1912
      Followed by: Solar eclipse of April 28, 1930


      = Tritos

      =
      Preceded by: Lunar eclipse of May 24, 1910
      Followed by: Lunar eclipse of March 22, 1932


      = Lunar Saros 130

      =
      Preceded by: Lunar eclipse of April 12, 1903
      Followed by: Lunar eclipse of May 3, 1939


      = Inex

      =
      Preceded by: Lunar eclipse of May 11, 1892
      Followed by: Lunar eclipse of April 2, 1950


      = Triad

      =
      Preceded by: Lunar eclipse of June 21, 1834
      Followed by: Lunar eclipse of February 21, 2008


      = Lunar eclipses of 1919–1922

      =


      = Saros 130

      =
      Lunar saros series 130, repeating every 18 years and 11 days, has a total of 71 lunar eclipse events including 56 umbral lunar eclipses (42 partial lunar eclipses and 14 total lunar eclipses). Solar Saros 137 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.


      = Half-Saros cycle

      =
      A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two annular solar eclipses of Solar Saros 137.


      See also


      List of lunar eclipses
      List of 20th-century lunar eclipses


      Notes




      External links


      1921 Apr 22 chart Eclipse Predictions by Fred Espenak, NASA/GSFC

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