A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 38
. In the annexed diagram, the effect of perpendicular and obliquerays is illustrated. It will be observed that the same quantity of 33. How are the seasons caused ? Why? Why is the heat greater in summerthan in winter? THE SEASONS. 35 rays that covers the north polar circle, when they are nearly… … THE SEASONS. sun at the vernal equinox, northern solstice, autumnalequinox, and winter solstice, respectively. They are 40. How are the four seasons marked and limited ? Why are they regular ? 36 THE SEASONS. regular—that is, always tli3 same from year to year,because the axis always points in the…
Astronomy
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