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Michael Maestlin (also Mästlin, Möstlin, or Moestlin) (30 September 1550, Göppingen – 20 October 1631, Tübingen) was a German astronomer and mathematician, known for being the mentor of Johannes Kepler. ==Career== Maestlin studied theology, mathematics, and astronomy/astrology at the Tübinger Stift in Tübingen, a town in Württemberg. He graduated as Magister in 1571 and became in 1576 a Lutheran deacon in Backnang, continuing his studies there. In 1580 he became a Professor of mathematics, first at the University of Heidelberg, then at the University of Tübingen where he taught for 47 years from 1583. In 1582 Maestlin wrote a popular introduction to astronomy. Among his students was Johannes Kepler (1571-1630).〔 〕 Although he primarily taught the traditional geocentric Ptolemaic view of the solar system, Maestlin was also one of the first to accept and teach the heliocentric Copernican view.〔 Maestlin corresponded with Kepler frequently and played a sizable part in his adoption of the Copernican system. Galileo Galilei's adoption of heliocentrism was also attributed to Maestlin.〔Smolka, Josef: ''Michael Mästlin and Galileo Galilei. (German Title: Michael Mästlin und Galileo Galilei)'' , 2002 Verlag Harri Deutsch, Frankfurt am Main, ''In the earlier literature it is incorrectly claimed that Mästlin, when travelling through Italy, converted Galilei to copernicanism. We know today that Galilei was first introduced to Copernicus' work through Christian Wursteisen.'' (Adsabs.harvard.edu )〕 The first known calculation 〔J J O'Connor and E F Robertson, The Golden ratio, 2001, ''The first known calculation of the golden ratio as a decimal was given in a letter written in 1597 by Michael Maestlin, at the University of Tübingen, to his former student Kepler. He gives "about 0.6180340" for the length of the longer segment of a line of length 1 divided in the golden ratio. The correct value is 0.61803398874989484821... The mystical feeling for the golden ratio was of course attractive to Kepler, as was its relation to the regular solids.'' (History.mcs.st-andrews.ac.uk )〕 of the (inverse) golden ratio as a decimal of "about 0.6180340" was written in 1597 by Maestlin in a letter to Kepler. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Michael Maestlin」の詳細全文を読む スポンサード リンク
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