Solar eclipse of October 27, 1780

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Solar eclipse of October 27, 1780
Type of eclipse
Nature Total
Gamma 0.8083
Magnitude 1.0244
Maximum eclipse
Duration 2m 0s
Coordinates 35.6N 58.6W
Max. width of band 138 km
Times (UTC)
Greatest eclipse 17:18:27
Saros 120 (48 of 71)
Catalog # (SE5000) 8991

A total solar eclipse occurred on October 27, 1780. 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 total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across the surface of the Earth, while a partial solar eclipse will be visible over a region thousands of kilometres wide.


During the American Revolutionary War, the first American solar eclipse expedition was organized and sent out from Harvard College in Massachusetts. A special immunity agreement was negotiated with the British to allow the scientists to work unharmed. The Harvard expedition, after all their efforts, missed the eclipse because they chose a site outside the path of totality. Modern analysis of this embarrassing incident for embryonic American science blame Samuel Williams for miscalculating the path of totality.[1][2]

Related eclipses[edit]

It is a part of solar Saros 120.

See also[edit]


  1. ^ ECLIPSES IN HISTORY by Ken Poshedly
  2. ^ Where did the 1780 eclipse go? Science Frontiers #22, JUL-AUG 1982. William R. Corliss