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Encyclopedia Britannica



RHETICUS, or RRAETICUS (1514-1576)

This article appears in Volume V23, Page 233 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: RAY-RHU
RHETICUS, or RRAETICUS (1514-1576) , a surname given to GEORGE
JOACHIM
 , German astronomer and mathematician, from his
birth
  at
Feldkirch
  in that part of
Tirol
  which was anciently the territory of the Rhaeti. Born on the 15th of February 1514, he studied at Tiguri with
Oswald
  Mycone, and afterwards went to Wittenberg where he was appointed professor of mathematics in 1537. Being greatly attracted by the new Copernican theory, he resigned the professorship in 1539, and went to Frauenberg to associate himself with Copernicus (q.v.), and superintended the printing of the De Orbium Revolutione which he had persuaded Copernicus to complete. Rheticus now began his
great
  treatise, Opus Palatinum de Triangulis, and continued to
work
  at it while he occupied his old chair at Wittenberg, and indeed up to his death at Cassovia in
Hungary
 , on the 4th of December 1576. The Opus Palatinum of Rheticus, was published by Valentine Otho, mathematician to the electoral prince palatine, in 1596. It gives tables of sines and cosines, tangents, &c., for every ro seconds, calculated to ten places. He had projected a table of the same kind to fifteen places, but did not live to complete it. The sine table, however, was afterwards published on this scale under the name of Thesaurus
Mathematicus (Frankfort, 16'3) by B. Pitiscus (1561-1613), who himself carried the calculation of a few of the earlier sines to twenty-two places. He also published Narratio de Libris Revolutionum Copernici (Gedenum, 1540), which was subsequently added to editions of Copernicus's works; and Ephemerides until 1551, which were founded on the Copernican doctrines. He projected numerous other works, as is shown by a
letter
  to Peter Ramus in f568, which Adrian Romanus inserted in the
preface
  to his Idea of Mathematics.


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