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 166
rid zone,which must be 150° wide, and frigid zones extending 75°from the poles. 226. Seasons of Venus.—As the sun must arrive at theequator and depart to its greatest distance from it twice dur-ing each sidereal period, there must be two summers andtwo winters at this part of the planet, and a… … Fig. 97 exibits the relative positions of the tropics and polar circles, theformer being the nearest to the poles. The sun is represented as in thenorthern solstice; and it will be seen that all places situated more than 15°north of the equator have constant day, and those more than 15° south ofit,…
Astronomy
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