Star Gazers' Stone, Survey pillar in Embreeville, Pennsylvania, US.
The Star Gazers' Stone stands as a limestone marker positioned 31 miles west of Philadelphia, measuring astronomical coordinates for geographical surveying purposes.
Charles Mason and Jeremiah Dixon established this stone in 1764 as a reference point during their survey to resolve the Pennsylvania-Maryland border dispute.
The stone represents early American land surveying methods and the development of state boundaries through astronomical observations in colonial times.
Visitors can access the stone through a designated parking area constructed in 2013, located on Stargazer Road north of Embreeville Road.
The stone served as the base for a temporary observatory where Mason and Dixon conducted celestial measurements during winter months of their four-year survey.
Location: Embreeville
GPS coordinates: 39.93858,-75.73222
Latest update: September 23, 2025 14:24
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