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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, 2022. 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 May 2022

Chapter Eight

Chapter Eight

(p.86) Chapter Eight
Cleomedes' Lectures on Astronomy

Alan C. Bowen

Robert B. Todd

University of California Press

This chapter shows that the size of the Earth is discountable in observations of all heavenly bodies except the Moon. The Earth must have the ratio of a center to the whole cosmos. Sundials also offer a major proof that the Earth has the ratio of a center to the heliacal sphere, since the shadow of the Earth revolves along with the Sun. So while the Earth has the ratio of a point to the height of the Sun, some use other arguments to establish that it does not have the ratio of a point to the sphere of the Moon. The Sun's approach and its subsequent withdrawal are identified with respect to its relation to the zenith.

Keywords:   size, Earth, heavenly bodies, cosmos, heliacal sphere, Sun, Moon

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