250th Anniversary: Astronomy Helps Create Mason-Dixon Line
On this date 250 years ago (1767
October 18), astronomers Charles Mason and Jeremiah Dixon completed surveying
most of the southern boundary of Pennsylvania,
what became the most famous boundary in U.S. history: the Mason-Dixon
Line. Local Native Americans
prevented the survey of the last 23 miles of the boundary line.
Philadelphia clock-maker and astronomer David Rittenhouse headed a
survey team which finished surveying those last 23 miles in 1784.
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| | | | 250th Anniversary: Astronomy Helps Create Mason-Dixon Line This photograph shows Pete Zapadka, a member of the Amateur Astronomers Association of Pittsburgh, le... | | | |
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Glenn A. Walsh, Project Director,