TP Rauenberg - solstice, sunrise

The Rauenberg primary triangulation point is the starting point for the calculation of geographic coordinates of the Prussian main triangular mesh spatial reference system (Hauptdreiecksnetz). As the origin, it defines the location and orientation of the modern German triangular mesh spatial reference system in relation to the reference surface of a chosen Bessel ellipsoid. Latitude and longitude (location) as well as the azimuth (orientation) are derived from astronomical measurements of the years 1853 and 1859.