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Tycho Brahe, (14 December 1546 –24 October 1601 ), was a Danish nobleman known for his accurate and comprehensive
astronomical and planetary observations.
• Tycho first built Uraniborg in 1576 (with a laboratory for his alchemical experiments in its cellar) and then Stjerneborg in 1581.
• Unusual for the time, Tycho established the Uraniborg as a research centre where almost 100 students and artisans had worked from 1576 to 1597.
Tycho was the preeminent observational astronomer of the pre-telescopic period, and his observations of stellar and
planetary positions achieved unparalleled accuracy for their
time.
Drawing of Cassipeia, with the position of the stars. "Nova Stella", the brightest is marked as "I".