x— cos. will include every it also varies directly as the sum of those small portions ; and since this sum di- portion of the spherical surface that can minishes as we approach the surface of radiate heat to the point. the sun, the law of the inverse square from the center fails." Let a=gc* + ~R*… … hot surface varies directly as the sine of 27tW fsin.xdx the angle of obliquity, and inversely as (a—b cos.ec)f the square of the distance, when the ra- cos. a? sin.ee dx diating surface is a point, it is required to J ( a— bcos.x)\ find the relation between the intensity of the heat at a point g,…
Engineering
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-351-242.webp)
