Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 247
astronomers who believed theEarth to be fixed and the centre of the celestial universe. Thehypothesis advanced by Ptolemy about a.d. 140 was univer-sally accepted for fourteen centuries and continued to receivea large measure of assent for some time after Copernicusadvanced the theory that the Sun… … Fig. 7-7.—The Ptolemaic System. upon the deferent, but moved around the circumference of asmaller circle called the epicycle, whilst the centre of this circlemoved round the deferent. Thus the actual motion of a planetwas compounded of two uniform circular motions, the motionof the deferent and…
Astronomy
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