Charles Mason

[[Artist's impression]] (1910) of Mason surveying the [[Mason–Dixon line]] Charles Mason (25 April 172825 October 1786) was a British-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. Provided by Wikipedia
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