Philadelphia in Philadelphia County, Pennsylvania — The American Northeast (Mid-Atlantic)
Surveyor - Astronomer - Scientist
April 1728 - October 25, 1786
English astronomer and surveyor who, with Jeremiah Dixon, laid out the Mason-Dixon Line - famous border between Maryland, Pennsylvania and Delaware - using little but the stars from God's Heavens, in the years 1763-1767.
Charles Mason was laid to rest at Christ Church Burial Ground on October 26, 1786, in a plot obtained by his good friend Benjamin Franklin from Church Warden Tench Coxe. The location of his grave in the burial grounds is unknown.
This original 1766 Pennsylvania-Maryland boundary stone, quarried in England, stood for two centuries upon the Mason-Dixon Line - and now honors the memory of its surveyor, Charles Mason.
This Plaque and Mason-Dixon Line Stone were dedicated August 31, 2013, by Surveyors Historical Society and the Mason-Dixon Line Preservation Partnership on behalf of surveyors, astronomers and scientists everywhere.
Topics. This historical marker is listed in these topic lists: Colonial Era • Science & Medicine. A significant historical month for this entry is April 1728.
Location. Touch for map. Marker is in this post office area: Philadelphia PA 19106, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Major William Jackson - 40th Signer of the U.S. Constitution (here, next to this marker); Thomas Smith (here, next to this marker); Matthew Clarkson (a few steps from this marker); William Henry Drayton (within shouting distance of this marker); Francis Hopkinson (within shouting distance of this marker); David Salisbury Franks (within shouting distance of this marker); Christ Church Burial Ground (within shouting distance of this marker); Chronology of Benjamin Franklin (within shouting distance of this marker). Touch for a list and map of all markers in Philadelphia.
Credits. This page was last revised on August 12, 2018. It was originally submitted on August 7, 2018. This page has been viewed 139 times since then and 12 times this year. Photos: 1, 2. submitted on August 7, 2018. • Bill Pfingsten was the editor who published this page.