A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 37
we see the nearer the perpendicular the diurnalcircles are, the shorter the twilight; while the more oblique theyare, the longer the twilight. THE SEASONS. 39. The seasons are canned by the inclination of theearths axis to the plane of its orbit. For the amount ofheat received at any place from the… … - s STmVKB AND WINTER KAYS. 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…
Astronomy
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