Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 142
ure normally occurs somewhat after noon. If there were no atmosphere and if the earth radiated heatas fast as it was acquired, there would be no lag in theseasons. In high altitudes, where the air is thin and dry,this condition is nearly realized and the lag of the seasons issmall, though the… … Fig. 44. — Because of the eccentricity of the earths orbit, summers in thenorthern hemisphere are longer than the winters. apparent diameter of the sun that the earth is at its peri-heUon on or about January 3, and at its aphelion on or aboutJuly 4. It follows from the way the earth describes…
Astronomy
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