Mason and Dixon were pioneers in bringing geodetic astronomy to the American colonies. Through the efforts of the Mason and Dixon Line Preservation Partnership, we can promote this scientific ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Keystones aren’t the only stones indelible to Pennsylvania’s character. Limestone monuments marking each mile of the Mason-Dixon Line — a survey line dating back to the 1760s intended to resolve a ...

(WHTM) — 260 years ago today, Charles Mason and Jeremiah Dixon arrived in Philadelphia to begin their survey of the boundary lines between Pennsylvania and Maryland. It would take them almost five ...