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Download A Short History of Astronomy (University Extension Manuals) by Arthur Berry PDF

By Arthur Berry

The Manuals will not be meant for reasons of easy schooling, yet for college students who've made a few strengthen within the topic handled The assertion of information is intended to demonstrate the operating of normal legislation, and the improvement of ideas , whereas, the ancient evolution of the topic handled is saved in view, besides its philosophical significance

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A 2> Short History of Astronomy [Cii I , 18 be illustrated in modern times by the eclipses of the sun which took place on July i8th, 1860, on July 29th, 1878, and on August 9th, 1896, but the first was visible in Southern Europe, the second in North America, and the third in Northern Europe and Asia 1 8. , , 99> I0 * ) See, for example, Old Moore's or ZadkiePs Almanack, CHAPTER II GREEK ASTRONOMY "The astionomei discoveis that gcomctiy, a pine human mind, is the measure of planetaiy motion " abstraction of the EMERSON 19 IN the earlier penod of Greek history one of the chief functions expected of astionomers was the pioper The Greeks, like earlier regulation of the calendar with a calendar based on the moon.

A 26 Short History of Astronomy [CH n & repugnant to unmstructed common sense, although piesented in such a crude form, without any of the evidence required to win general assent, was, however, undoubtedly a valuable contribution to astronomical thought It is well worth Coppeimcus in the great book which is the foundation of modern astionomy (chapter iv 75) especially quotes Philolaus and othei Pythagoreans as authorities for his doctrine of the motion of the earth Three other Pythagoreans, belonging to the end of the 6th century and to the 5th century B c Hicetas of notice that , , Syracuse, Herachtus, and Ecphantus, are explicitly mentioned by later writers as having believed in the rotation of the earth.

9. Each star describes in its daily motion a circle, the size which depends on its distance from the poles Fig. 2 shews the paths described by a number of stars near the pole, recorded photographically, during part of a night. The pole-star describes so small a cncle that its motion can only with difficulty be detected with the naked eye, stars a of little until farther off the pole describe largei circles, and so on, to stars half-way between the two poles, which we come circle which can be drawn on the The circle on which these stars he and sphere which is described by any one of them daily is called the equator.

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