The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 210
from the sun at that time. Illustration. Fig. 137 represents the manner in which the raysof the sun fall upon the earth in summer and in winter. The northpole of the earth, at all seasons, constantly points to the north star,N; and when the earth is nearest to the sun, the rays from the sunfall as… … when the earth is nearest to the sun. But, when the earth is inaphelion, the rays fall almost vertically, or perpendicularly ; and,although the earth is then nearly three million of miles further fromthe sun, the heat is greatest, because the rays fall more directly, andhave a less portion of the…
Physics
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