• Source: October 1939 lunar eclipse

      • A partial lunar eclipse occurred at the Moon’s descending node of orbit on Saturday, October 28, 1939, with an umbral magnitude of 0.9876. 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 about 5.3 days after apogee (on October 23, 1939, at 0:05 UTC), the Moon's apparent diameter was smaller.
      This lunar eclipse was the last of an almost tetrad, with the others being on May 14, 1938 (total); November 7, 1938 (total); and May 3, 1939 (total).
      This was the last partial lunar eclipse of the first set of partial eclipses in Lunar Saros 135 as well as the largest partial lunar eclipse of the 20th century.


      Visibility


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


      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 1939

      =
      An annular solar eclipse on April 19.
      A total lunar eclipse on May 3.
      A total solar eclipse on October 12.
      A partial lunar eclipse on October 28.


      = Metonic

      =
      Preceded by: Lunar eclipse of January 8, 1936
      Followed by: Lunar eclipse of August 15, 1943


      = Tzolkinex

      =
      Preceded by: Lunar eclipse of September 14, 1932
      Followed by: Lunar eclipse of December 8, 1946


      = Half-Saros

      =
      Preceded by: Solar eclipse of October 21, 1930
      Followed by: Solar eclipse of November 1, 1948


      = Tritos

      =
      Preceded by: Lunar eclipse of November 27, 1928
      Followed by: Lunar eclipse of September 26, 1950


      = Lunar Saros 135

      =
      Preceded by: Lunar eclipse of October 16, 1921
      Followed by: Lunar eclipse of November 7, 1957


      = Inex

      =
      Preceded by: Lunar eclipse of November 17, 1910
      Followed by: Lunar eclipse of October 6, 1968


      = Triad

      =
      Preceded by: Lunar eclipse of December 26, 1852
      Followed by: Lunar eclipse of August 28, 2026


      = Lunar eclipses of 1937–1940

      =


      = Saros 135

      =
      It was part of Saros series 135.


      = 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 total solar eclipses of Solar Saros 142.


      See also


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


      Notes




      External links


      1939 Oct 28 chart Eclipse Predictions by Fred Espenak, NASA/GSFC

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