Braak Base Line

After the reduction by Christian August Friedrich Peters in 1853, the length was determined to be 3,014.45115 toises (5,875.2747 meters).

[1] For the Danish survey, a route in a flat area was chosen:[2] Observing the points from the Michaeliskirche in Hamburg and the Friedenskirche in Siek, which later burned down, resulted in the first major side of the triangle for the Danish and Hanoverian triangulation .

Heinrich Christian Schumacher had a good relationship with the Danish King Friedrich VI., which enabled him to set up the observatory in Altona near Hamburg, which was then in Denmark.

So Schumacher initiated the Danish king's request to the Hanoverians to let Gauss participate in the measurement of the baseline.

Repsold also made important contributions to the determination of the Altona meridian and the meridian circle of the Göttingen Observatory (distance 7.5 toises or 14.618 meters) in the form of his excellent instruments and improvements to existing instruments.