Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 198
the seasons. (See Fig. 115). In the figure a beam ofsunshine having the cross-section A BCD strikes thesoil cbDA at an angle h. Itis clear that the area cbDAis greater than the areaABCD. The amount ofheat in the sunbeam isalways the same. This con-stant amonnt of heat is dis-tributed over a larger… … Fig. 115.—The Effect of theSuns Elevation on theAmount of Heat Impartedto the Soil.
Astronomy
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