A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 89
the times at which the earth enters the correspond-ing signs in the outer circle. Of course, the sun, at these dates, enters theopposite signs. 122. Summer is caused by the rays of the sun being morenearly perpendicular than in the other seasons, so that thesame part of the earths surface receives… … SUMMEB AND WINTEE EATS. In Fig. 54, it will be observed that the same quantity of rays that coversthe north polar circle, when they are direct, covers the whole space fromthe antarctic circle to the equator, when they are oblique. 123. The seasons are not precisely of equal length, be-cause the…
Astronomy
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