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    • Source: Solar eclipse of April 18, 1931

      • A partial solar eclipse occurred at the Moon's ascending node of orbit between Friday, April 17 and Saturday, April 18, 1931, with a magnitude of 0.5107. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth.
      A partial eclipse was visible for parts of East Asia and North Asia.


      Eclipse details


      Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other 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 1931

      =
      A total lunar eclipse on April 2.
      A partial solar eclipse on April 18.
      A partial solar eclipse on September 12.
      A total lunar eclipse on September 26.
      A partial solar eclipse on October 11.


      = Metonic

      =
      Preceded by: Solar eclipse of June 29, 1927
      Followed by: Solar eclipse of February 3, 1935


      = Tzolkinex

      =
      Preceded by: Solar eclipse of March 5, 1924
      Followed by: Solar eclipse of May 29, 1938


      = Half-Saros

      =
      Preceded by: Lunar eclipse of April 11, 1922
      Followed by: Lunar eclipse of April 22, 1940


      = Tritos

      =
      Preceded by: Solar eclipse of May 18, 1920
      Followed by: Solar eclipse of March 16, 1942


      = Solar Saros 147

      =
      Preceded by: Solar eclipse of April 6, 1913
      Followed by: Solar eclipse of April 28, 1949


      = Inex

      =
      Preceded by: Solar eclipse of May 7, 1902
      Followed by: Solar eclipse of March 27, 1960


      = Triad

      =
      Preceded by: Solar eclipse of June 16, 1844
      Followed by: Solar eclipse of February 15, 2018


      = Solar eclipses of 1928ā€“1931

      =
      This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.
      The partial solar eclipse on June 17, 1928 occurs in the previous lunar year eclipse set, and the partial solar eclipse on September 12, 1931 occurs in the next lunar year eclipse set.


      = Saros 147

      =
      This eclipse is a part of Saros series 147, repeating every 18 years, 11 days, and containing 80 events. The series started with a partial solar eclipse on October 12, 1624. It contains annular eclipses from May 31, 2003 through July 31, 2706. There are no hybrid or total eclipses in this set. The series ends at member 80 as a partial eclipse on February 24, 3049. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
      The longest duration of annularity will be produced by member 38 at 9 minutes, 41 seconds on November 21, 2291. All eclipses in this series occur at the Moonā€™s ascending node of orbit.


      = Metonic series

      =
      The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's ascending node.


      = Tritos series

      =
      This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (ā‰ˆ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (ā‰ˆ 33 years minus 3 months) come close (ā‰ˆ 434.044 anomalistic months), so eclipses are similar in these groupings.
      The partial solar eclipse on November 4, 2116 (part of Saros 164) is also a part of this series but is not included in the table below.


      = Inex series

      =
      This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (ā‰ˆ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (ā‰ˆ 87 years minus 2 months) comes close (ā‰ˆ 1,151.02 anomalistic months), so eclipses are similar in these groupings.


      Notes




      References


      Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
      Besselian elements


      External links

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