Tycho Brahe and observational astronomy Tycho Brahe (1546–1601, Danish): greatest pre-telescopic observational astronomer. Studied Ptolemy’s Almagest ; also astrology and alchemy. 1572 — Spotted a new star ( nova ), showed by measuring its parallax that it must be far above the Moon, thus contradicting Aristotle’s doctrine of that the Heavens are eternal and unchanging. 1576 — Danish king granted the island of Hven to Tycho as site for a new observatory: Uraniborg . There Tycho and his assistants made accurate and systematic observations of the positions of the stars and planets. 1577 — Tycho showed that the path of a comet crossed the orbits of the
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