And I agree with you on it being south of us. I always thought of it like this below
MjL
#2 Click this link to see Blog page --> 10/18/2016
So I looked up the 39th parallel and it actually is across the middle of Illinois #MasonDixon (Part of a longer thread)
MjL
#3 Click this link to see Historic Photos page --> 10/18/2021 #1
In 1767, the Mason-Dixon line, the boundary between colonial Pennsylvania, Maryland and Delaware, was set as surveyors astronomers Charles Mason and Jeremiah Dixon completed their survey. #MasonDixon No idea how surveyors became astronomers in this #Caption.