This 1665 diagram shows the castle of Uraniborg, a Danish observatory founded by Tycho Brahe. The castle was built from 1576 to 1580 and was the last major observatory built without a telescope. The data collected here was used to prove that the earth orbited the sun. Uraniborg was abandoned in 1597.
Image: “Arcis Vranibvrgi” by Joan Blaeu (1665). From the David Rumsey Historical Map Collection.
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