By Arthur Berry
The Manuals are usually not meant for reasons of basic schooling, yet for college kids who've made a few boost within the topic handled The assertion of information is intended to demonstrate the operating of common legislation, and the advance of ideas , whereas, the ancient evolution of the topic handled is stored in view, besides its philosophical significance
Science, Astronomy, glossy & technologies, common Sciences
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Extra resources for A Short History of Astronomy (University Extension Manuals)
When It is often more convenient we are using the sphere as a mere geometrical device for to regard the sphere representing the position of the stars as moving with the observer, so that he always remains at the centre 8 Although the stars all appeal to move across the sky ( 5), and their rates of motion differ, yet the distance between any two stars remains unchanged, and they weie consequently regarded as being attached to the celestial Moreover a little careful observation would have sphere shown that the motions of the stars in different parts of the sky, though at first sight very different, weie just such as would have been produced by the celestial sphere with the stars attached to it turning about an axis passing through the centre and through a point in the northern This point is called sky close to the familiar pole-star.
Years, Jupitei in one year, Venus in 225 12 years, Mais in 2 years, the sun m 23C/S jr IG 6 The apparent path of Jupiter from Oct, 28, 1897, to The dates printed in the diagram shew the 3, 1898 Sept positions of Jupiter m moon 27 days, and Mercury in 88 days, and the order was usually taken to be the order of distance, The Saturn being the most distant, the moon the neaiest natural to think of the stars being seen above us it was and most distant celestial bodies as being the highest, and Mars being beyond the accordingly Saturn, Jupiter, from the sun were called superior planets, as distinguished days, this two inferior planets Venus and Mercury.
That the moon shines by reflected light received from the sun ! Plato is said to have suggested to his pupils as a worthy pioblem the explanation of the celestial motions by means of a combination of uniform cnculai or spherical motions Anything like an accurate theory of the celestial motions, agieemgwith actual obseivation, such as Hipparchus and Ptolemy afteiwaids constructed with fair success, would hardly seem to be in accordance with Plato s ideas of the true astronomy, but he may well have wished to see established some simple and haimonious geometrical scheme which would not be altogether at variance with known facts 26 Acting to some extent on this idea of Plato's, Eudo&m of Cnidus (about 409-356 BC) attempted to explain the most obvious peculiarities of the celestial motions by means of a combination of unifoim circular motions He may be regarded as repi cscntative of the tiunsition from speculative " Republic, VII.
A Short History of Astronomy (University Extension Manuals) by Arthur Berry