From Nebula To Nebula; Being An Expansion Of The Principle Of Universal Gravitation To The Solution…

Paperback | February 11, 2012

byGeorge Henry Lepper

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ... II GRAVITATION VERSUS INERTIA AS THE MOTIVE POWER OF PLANETS Probably the first system of celestial motions meriting the epithet "scientific" was that devised by Claudius Ptolemy about the middle of the second century of our era. According to him, the earth was a fixed point and the absolute center of the universe around which the sun, moon, planets, and stars, all revolved, at various distances, every twenty-four hours. So far the theory may be called the Impressionistic, inasmuch as it relied wholly upon the concerted evidence of the three senses--sight, hearing, and feeling--which of themselves lead to no other conclusion. Having once assumed that the heavenly bodies revolve daily around the earth, it was only natural to infer that they do so in circles. But the ancients went further, and gave what seemed to them an unanswerable ground for this inference, namely, that it is metaphysically abhorrent to suppose that the Creator would choose any but the perfect curve (every point of the circumference of a circle being equi distant from the center) for the heavenly bodies to pursue. However, systematic observation showed vagaries of movement on the part of the planets that appeared to contradict this view. Had the question remained simply that of explaining the phenomena, the discovery of the ellipticity of the paths of planets might have been made then and there, and both Copernicus and Kepler been anticipated by many centuries. Unfortunately, the metaphysical deduction as to the perfection of the circle, and the anthropocentric and geocentric ideas of that age, were too deeply rooted in the minds of the ancient philosophers to allow conflicting thoughts to enter. Ptolemy sought to harmonize fact with fancy by the device of imagining the planet to be trave...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ... II GRAVITATION VERSUS INERTIA AS THE MOTIVE POWER OF PLANETS Probably the first system of celestial motions meriting the epithe...

Format:PaperbackDimensions:36 pages, 9.69 × 7.44 × 0.07 inPublished:February 11, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217839355

ISBN - 13:9780217839358

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