The 45° Alignment. Flyover from South-West to North-East
This alignment passes through five ancient sites on a 45° bearing, including the church of Rennes-les-Bains.
This video shows the two meridians and the 45° alignment, showing how they relate.
The La Pique meridian corresponds to 2°17'50"E, and the Pech Cardou meridian to 2°19'40"E.
The distance between them is therefore 1°50', or 110 arcseconds.
