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Who gave Tycho Brahe the island of Ven for his observatory?

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Painting of Danish astronomer Tycho Brahe wearing a black robe with a white ruffled collar and a gold chain necklace with a large pendant. — Tycho Brahe Tycho Brahe.

King Frederick II of Denmark granted the island of Ven to Tycho Brahe in 1576.12

The king provided the island, located in The Sound between Copenhagen and Helsingør, along with financial support to ensure that the astronomer remained in Denmark rather than establishing his observatory in Germany. On this island, Tycho constructed the famous observatory known as Uraniborg.21