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Duration of Day

Published online by Cambridge University Press:  03 November 2016

A. H. Bell
A. H. Bell*
Affiliation:
Sheerness Technical Institute
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Extract

The following is a simple method of establishing the formula for the determination of the duration of day, at any latitude, for a known declination of the sun.

terminator or limit of the sun's illumination of the earth (at right angles to the line showing the direction of the sun's rays), ά is the point at which the terminator, άO'c', cuts the elevation of the line of latitude λ.

Referring to the plan, α and α are the points in plan corresponding to ά in elevation ; 0 is the plan of the polar axis.

Type
Research Article
Information
The Mathematical Gazette , Volume 8 , Issue 122 , March 1916 , pp. 244 - 245
Copyright
Copyright © Mathematical Association 1916

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