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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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Chapter Four1

Chapter Four1

(p.50) Chapter Four1
Cleomedes' Lectures on Astronomy

Alan C. Bowen

Robert B. Todd

University of California Press

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

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