Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 222
sun, accordingly the amount of light illu-mining a surface of one mile square on the planet Mercuryis to that which falls upon the same extent of surface onthe earth as 64 to 9. The intensity of light is thereforeabout seven times greater at Mercury than at the earth. 439. The law of the decrease… … IHE INTENSITY OF THE SOLAR LIGHT VARIES INVERSELY AS THB SQUARE OfTHE DISTANCE. be a point on the suns surface from which light emanates,falling upon the squares BCDE, FGHI, JKLM. FGHIis twice as far from A as BCDE, and contains four timesas much surface; JKLM is four times as far from A asBCDE,…
Astronomy
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