Charles Mason

Charles Mason (Oakridge Lynch, near Stroud, Gloucestershire, April 1728 – Philadelphia, October 25, 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).

Read more about Charles Mason:  Early Career, 1761 Transit of Venus, The Mason–Dixon Line Survey, Career After The Mason–Dixon Line Survey, Posthumous Recognition