Tycho's map of the island of Hven, Denmark. L,M,K are large fishponds. A in the centre of the island is Tycho's observatory, Uraniborg. Tycho Brahe (Tyge Ottesen Brahe - 1546-1601) Danish astronomer, astrologer and alchemist who built astronomical instruments which enabled him to make the most accurate observations of his time.

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