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I was looking at this page

http://www.illustratingshadows.com/www-formulae-collection.pdf

and found the equation used for estimating the solar declination (sun declination). One problem, though, I wish to cite this equation in my work and was hoping there would be a textbook that shows this same equation? Can anyone suggest a reference for this other than a website?

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A simple Google-book search of "solar declination" lead me to this Google-book preview of Solar Energy Engineering: Processes and Systems by Soteris A. Kalogirou. This book gives the Spencer formula as Equation (2.6), on page 55.

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