Science & Tech
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In 1763, the southernmost point of Philadelphia was determined here as the starting point for the survey of one of the nation’s most important borders. Charles Mason and Jeremiah Dixon took scientific measurements of a degree of latitude, elevating professional surveying standards. The survey ended a land dispute begun by William Penn and Lord Baltimore, although western Pennsylvania Indian wars and severe weather delayed completion of the line until 1768.
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Philadelphia, Pennsylvania · United States
