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Cleomedes' Lectures on AstronomyA Translation of  The Heavens$
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Cleomedes and Lawrence Witmer

Print publication date: 2004

Print ISBN-13: 9780520233256

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520233256.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2019. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 18 October 2019

Chapter Five

Chapter Five

Chapter:
(p.145) Chapter Five
Source:
Cleomedes' Lectures on Astronomy
Author(s):

Alan C. Bowen

Robert B. Todd

Publisher:
University of California Press
DOI:10.1525/california/9780520233256.003.0014

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

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