Chapter

Chapter Five

Alan C. Bowen and Robert B. Todd

in Cleomedes' Lectures on Astronomy

Published by University of California Press

Published in print January 2004 | ISBN: 9780520233256
Published online March 2012 | e-ISBN: 9780520928510 | DOI: http://dx.doi.org/10.1525/california/9780520233256.003.0014
Chapter Five

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This chapter states that the phases of the Moon are caused by its motion in relation to the Sun and the Earth. In accordance with its motion based on choice, it approaches the Sun at one time and withdraws from it at another, as it goes from conjunction to full Moon and from full Moon to conjunction, the light from the Sun goes round the whole Moon in its circuit of it. By moving relative to its illumination from the Sun, the Moon is, in other words, affected in just the same way as is the Earth through being stationary. The cause of the Moon's having differences in its shapes is explored. The conjunctions of the Moon with the Sun do not always maintain an equal time interval.

Keywords: Moon; Sun; Earth; motion; conjunctions

Chapter.  3452 words. 

Subjects: Classical Philosophy

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