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| | Tycho Brahe (1546-1601) |
 | | Consequently, Tycho turned to professional astronomy and with the help of Danish King Frederick II, established his observatories "Uranienburg" (1580) and "Sternenburg" (or Stjerneborg, 1584) on the island Hven, where he performed astrometric measures which were the best in pre-telescopic times. |
 | | Results were the discovery that comets are situated in space beyond the Moon, of Lunar variation and acurate planetary pathes in the sky. |
 | | Tycho's observing place, Stjerneborg on the island Hven, now Swedish territory, has been reconstructed and can be visited as the Tycho Brahe Museum, see e.g. |
| www.seds.org /messier/Xtra/Bios/tycho.html (623 words) |
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