Solar eclipse of October 27, 1780
|Solar eclipse of October 27, 1780|
|Type of eclipse|
|Max. width of band||138 km|
|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.
It is a part of solar Saros 120.
- NASA chart graphics
- NASA Besselian elements
- Observations of a Solar Eclipse, October 27, 1780, Made at St. John's Island, by Mess'rs. Clarke and Wright, by Joseph Peters 1783 American Academy of Arts & Sciences.
- A Memoir, Containing Observations of a Solar Eclipse of October 27, 1780 by Joseph Willard, 1783
- Where Did the 1780 Eclipse Go? Rothschild, Robert F., Sky and Telescope, 63:558, 1982
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