Concept

Uraniborg

Summary
Uraniborg (Uranienborg, Uraniborg) was a Danish astronomical observatory and alchemy laboratory established and operated by Tycho Brahe. It was the first custom-built observatory in modern Europe, and the last to be built without a telescope as its primary instrument. Uraniborg was built 1576-1580 on Hven, an island in the Øresund between Zealand and Scania, Sweden, which was part of Denmark at the time. It was expanded with the underground facility Stjerneborg (Stjärneborg) on an adjacent site. Brahe also innovated and invented many precision instruments which he used to carry out his studies in the observatory. Research was done in the fields of astronomy, alchemy, and meteorology by Tycho and his assistants. Brahe abandoned Uraniborg and Stjerneborg in 1597 after he fell out of favour with the Danish king, Christian IV of Denmark; Brahe left the country, and the institution was destroyed in 1601 after his death. Hven was later lost to Sweden, and the Rundetårn (Round Tower) in Copenhagen was inaugurated in 1642 as a replacement for Uraniborg's astronomical functions. Restoration of Uraniborg's grounds began in 1985. The building was dedicated to Urania, the Muse of Astronomy, and it was named Uraniborg, "The Castle of Urania". It was the first custom-built observatory in modern Europe, and the last to be built without a telescope as its primary instrument. The cornerstone was laid on August 8, 1576. The sandstone and limestone-framed brick building was constructed from the year 1576 to 1580. Built in the Flemish Renaissance style, the erection of the site was overseen by Danish architect Hans van Emden and sculptor Johan Gregor van der Schardt. The main building of Uraniborg was square, about 15 meters on a side, and built mostly of red brick. Two semi-circular towers, one each on the north and south sides of the main building, gave the building a somewhat rectangular footprint overall. The plan and façade of the building, and also the plan of the surrounding gardens, are designed on grids, with proportions that Tycho carefully specified.
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Tycho Brahe
Tycho Brahe (ˈtaɪkoʊ_ˈbrɑː(h)i,_-(h)ə) ; born Tyge Ottesen Brahe, generally called Tycho; 14 December 1546 24 October 1601) was a Danish astronomer, known for his comprehensive and unprecedentedly accurate astronomical observations. He was known during his lifetime as an astronomer, astrologer, and alchemist. He was the last major astronomer before the invention of the telescope. In 1572, Tycho noticed a completely new star that was brighter than any star or planet.
Johannes Kepler
Johannes Kepler (ˈkɛplər; joˈhanəs ˈkɛplɐ, -nɛs -; 27 December 1571 – 15 November 1630) was a German astronomer, mathematician, astrologer, natural philosopher and writer on music. He is a key figure in the 17th-century Scientific Revolution, best known for his laws of planetary motion, and his books Astronomia nova, Harmonice Mundi, and Epitome Astronomiae Copernicanae. These works also provided one of the foundations for Newton's theory of universal gravitation.