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RHETICUS, or RRAETICUS (1514-1576)

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Originally appearing in Volume V23, Page 233 of the 1911 Encyclopedia Britannica.
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RHETICUS, or RRAETICUS (1514-1576)  , a surname given to See also:GEORGE See also:JOACHIM, See also:German astronomer and mathematician, from his See also:birth at See also:Feldkirch in that See also:part of See also:Tirol which was anciently the territory of the Rhaeti . See also:Born on the 15th of See also:February 1514, he studied at Tiguri with See also:Oswald Mycone, and afterwards went to See also:Wittenberg where he was appointed See also:professor of See also:mathematics in 1537 . Being greatly attracted by the new Copernican theory, he resigned the professorship in 1539, and went to Frauenberg to See also:associate himself with See also:Copernicus (q.v.), and superintended the See also:printing of the De Orbium Revolutione which he had persuaded Copernicus to See also:complete . See also:Rheticus now began his See also:great See also:treatise, See also:Opus Palatinum de Triangulis, and continued to See also:work at it while he occupied his old See also:chair at Wittenberg, and indeed up to his See also:death at Cassovia in See also:Hungary, on the 4th of See also:December 1576 . The Opus Palatinum of Rheticus, was published by See also:Valentine See also:Otho, mathematician to the electoral See also:prince See also: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 See also:kind to fifteen places, but did not live to complete it . The sine table, however, was afterwards published on this See also:scale under the name of See also:Thesaurus Mathematicus (See also: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 See also:editions of Copernicus's See also:works; and Ephemerides until 1551, which were founded on the Copernican doctrines . He projected numerous other works, as is shown by a See also:letter to See also:Peter See also:Ramus in f568, which See also:Adrian See also:Romanus inserted in the See also:preface to his See also:Idea of Mathematics .

End of Article: RHETICUS, or RRAETICUS (1514-1576)
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