Abstract
ABSTRACT All discussions of climate take as their primary datum the flux of solar energy on a unit horizontal surface outside the atmosphere as a function of latitude and time. Published tables and graphs of this quantity do not provide the details of daily variation that are often desired. Computations of instantaneous values through the daily cycle are laborious unless the quantity of data needed justifies the employment of a computer. Modest amounts of such data may be obtained by means of the graphic procedure described and illustrated here, with an accuracy sufficient for climatological purposes and with less labor than is required for their straightforward computation with a desk calculator. A related graphic construction yields the azimuth of the sun at any latitude and time. The procedures are rigorous, subject only to the inaccuracies of measurement and drafting.
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