. "1728Z"^^ . . "1786Z"^^ . "1786-10-25Z"^^ . . "Charles Mason (April 1728 [baptised 1 May] \u2013 25 October 1786) was a British astronomer who made significant contributions to 18th-century science and American history, particularly through his involvement with the survey of the Mason-Dixon line, which came to mark the border between Maryland and Pennsylvania (1764\u20131768). The border between Delaware and Maryland is also defined by a part of the Mason-Dixon line."@en . . . . . "Charles Mason"@en . "British astronomer" . . "Mason, Charles"@en . . . .