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3.9 Solar Parameters

Solar radiation and energy calculations require some geometric and time quantities concerning the sun position relative to the earth and any point on the earth. It is also necessary to know the relation between the local standard time and the solar time.

3.9.1 Earth's Eccentricity

It is desirable to have the distance and the earth's eccentricity in mathematical forms for simple calculations. Although a number of such forms are available of varying complexities, it is better to have simple and manageable expressions such as the one suggested by Spencer (1972), who gave the eccentricity, e, correction factor of the earth's orbit as e =1.00011 + 0.034221 cosT + 0.001280sinT

where day angle, T, in radians is given as

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