Chapter

Chapter Four<sup>1</sup>

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/9780520233256.003.0005
Chapter Four1

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This chapter reviews the lengths of daytimes and nighttimes and states that they differ at differing latitudes because of the motion of the Sun in the zodiacal circle. The Sun provides daytimes that increase in length when it turns back from the winter tropic to the northern [parts] of the heavens, and [daytimes] decrease in length when the Sun goes down in the opposite direction from the summer tropic to the south and the winter tropic. While daytime lengthens and shortens over the same time period for everyone occupying the temperate zone, the addition and subtraction [of daytime] is still not equal at all [latitudes]. The longest daytimes at each latitude are made equal to the longest nighttimes, and neither the darkenings nor illuminations of the air exceed one another, but the year as a whole divides them equally.

Keywords: daytimes; nighttimes; latitudes; Sun; zodiacal circle; heavens

Chapter.  5664 words. 

Subjects: Classical Philosophy

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