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Tycho Brahe

Tycho Brahe is the name of a main character from the comic Penny Arcade.

Tycho Brahe (December 14, 1546 - October 24, 1601) was a Danish astronomer. He had Uraniborg built; which become an early "research institute[?]". For purposes of publication, Tycho owned a printing press and paper mill[?]. His best known assistant was Kepler.

Tycho realized that progress in the science of astronomy could be achieved, not by occasional haphazard observations, but only by systematic and rigorous observation, night after night, and by using instruments of the highest accuracy obtainable. He was able to improve and enlarge the existing telescopes, and construct entirely new ones. Brahe's naked eye measurements, of planetary parallax, were accurate to the arcminute. These measurements, following Brahe's death, became the possessions of Kepler.

While a student, Tycho lost part of his nose in a duel. For the rest of his life, he wore a silver replacement.

Cassiopeia In November, 1572, Tycho had observed a very bright star which had unexpectedly appeared in the constellation Cassiopeia. Since it had been maintained since Antiquity[?] that the world of the fixed stars was eternal and unchangeable, other observers held that the phenomenon was something in the Earth's atmosphere. Tycho, however, observed that the parallax of the object did not change from night to night, suggesting that the object was far away. Tycho argued that a nearby object should appear to shift its position with respect to the background. He published a small book, De Stella Nova (1573), thereby coining the term nova for a "new" star. (We now know that Tycho's star was a supernova) - This discovery was decisive for his choice of astronomy as a profession.

Heliocentrism Kepler tried, but was unable, to persuade Brahe to adopt the heliocentric model of the solar system. Tycho believed in the geocentric model for the same reasons that he argued that the supernova of 1572 was not near the Earth. He argued that if the Earth were in motion; than, nearby stars should appear to shift their positions, with respect to background stars. This parallax does happen, but is not visible without a telescope.

Benátky, Uraniborg and Stjerneborg King Frederick II. of Denmark and Norway, impressed with Tycho's 1572 observations, financed the construction of two observatories for Tycho on Ven. These were Uraniborg and Stjerneborg.

Because he disagreed with Christian IV., the new king of his country, he moved to Prague in 1599. Sponsored by Rudolf II., the Holy Roman Emperor, he built a new observatory (in a castle in Benátky 50 km away from Prague) and worked there until his death.

Misc 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. After his death, his records of the motion of the planet Mars enabled Kepler to discover the laws of planetary motion, which provided powerful support for the Copernican heliocentric theory of the solar system. Tycho himself was not a Copernican, but proposed a compromise system in which the planets other than Earth orbited the Sun while the sun orbited the earth.

He was aware that a star observed near the horizon appears with a greater altitude than the real one, due to atmospheric refraction, and he worked out tables for the correction of this source of error.

Brahe died in 1601, several days after his bladder burst during a banquet. It has been said that to leave the banquet, before it concluded, would be "the height" of bad manners.

Recent investigations suppose that Tycho did not die directly of his urinary problems, but maybe poisoned himself unintentionally by administering some medicine containing arsenic (he pursued alchemical studies as well throughout his life, however he seems either not to have kept records or to have destroyed them).

• Victor E. Thoren: The Lord of Uraniborg: a biography of Tycho Brahe (Cambridge University Press, 1990) (ISBN 0-521-35158-8) (520pp)

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