Charles Mason

Charles Mason (25 April 1728 – 25 October 1786) was an English-American astronomer who made significant contributions to 18th-century science and American history, particularly through his survey with Jeremiah Dixon of the Mason–Dixon line, which came to mark the border between Maryland and Pennsylvania (1764–1768). The border between Delaware and Maryland is also defined by a part of the Mason–Dixon line.

For other people named Charles Mason, see Charles Mason (disambiguation).
Not to be confused with Charles Manson.

Charles Mason
Illustration of Mason surveying the Mason–Dixon line in 1910
Born25 April 1728 (baptised 1 May)
Oakridge Lynch, Gloucestershire, England
Died25 October 1786(1786-10-25) (aged 58)
Philadelphia, Pennsylvania, U.S.
NationalityKingdom of Great Britain
Known forMason–Dixon line
Scientific career
FieldsAstronomy, surveying
Signature
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