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Charles Mason
Charles Mason (April 1728 (1 May )〔(mdlpp: A NOTE ON CHARLES MASON'S ANCESTRY AND HIS FAMILY, H. W. ROBINSON, Lately Librarian of the Royal Society of London ). Retrieved 6 July 2015〕25 October 1786) was an English 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 (1764–1768). The border between Delaware and Maryland is also defined by a part of the Mason-Dixon line.
==Early career==
Mason's early career was spent at the Royal Greenwich Observatory near London. He served as assistant astronomer from 1756 to 1760 under the Reverend James Bradley, the Astronomer Royal.
While employed at the Greenwich Observatory, Mason became familiar with Professor Tobias Mayer’s ''Tables of the Moon''. The ''Lunar Tables'' were designed to solve the problem of determining longitude at sea, a challenge that frustrated scientists and navigators for decades. Mason worked throughout his life to perfect the ''Lunar Tables'' as a method of improving navigation at sea. In 1787, Mason was awarded £750 by the Board of Longitude for his work on perfecting the ''Tables''.〔Cope, Thomas D. and H. W. Robinson. "Charles Mason, Jeremiah Dixon and the Royal Society." ''Notes and Records of the Royal Society of London''. vol 9, no 7, 1951. p 75.〕
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