Quadrant used by Tycho Brahe, 1560-1565.
© Science Museum / Science & Society Picture Library
This astronomical instrument is an exact copy of an azimuth quadrant asociated with the famous Danish astronomer, Tycho Brahe (1546-1601). Made around 1560, it was originally owned by the German aristocrat Wilhelm IV, Landgrave of Hese-Kasel. The azimuth quadrant could be used to measure both the altitude and horizontal direction of celestial objects. The original resides and is currently on display at the Staatliche Museen in Kasel, Germany. In 1876 it was put on show in London at the 'Special Loan Collection of Scientific Apparatus' display at the South Kensington Museum, precursor to the Science Museum. After the exhibition and before the instrument was returned to Germany, it was copied by Elkington & Company to make this replica.