File:Uranography. and Atlas (1850) (14596472788).jpg

Identifier: uranographyatlas00kend (find matches)
Title: Uranography. & Atlas
Year: 1850 (1850s)
Authors: Kendall, Bzra O. (from old catalog)
Subjects:
Publisher: (n.p.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ce, his appearance to them is both anticipatedand retarded, by the power of refraction, muchlonger than to us: and, in the second place, theyhave a very long twilight, before his rising andafter his setting; for the twilight begins whenthe sun is within eighteen degrees of the hori-zon, and continues till he has sunk to the samedistance below it; and his greatest depressionis but 23i degrees, or 5^ more than will affordthem twilight. In addition to this, the moon isabove the horizon of the poles for a fortnight to-gether; for, as she passes monthly through thewhole ecliptic, which is one half north and theother half south of the equator, she must continueto shine over one or the other of the poles till shereturns to the equator. The polar regions have alsoa third benefit, in having their winter full moonsin the highest altitude, describing nearly the sametrack as their summer sun. THE SEASONS. Upon the position of the earths axis towardsthe sun, depends not only the length of days and
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The Seasons. THE EARTH. 221 nights, but also the variety of the seasons. Bythe inclination of the axis of the earth, every partof the planet is by turns presented to the sun : andin those parts where the suns rays fall most per-pendicularly, it is summer; but where they fall inthe most oblique direction, it is winter. The in-termediate periods, between the greatest and leastobliquity of the suns rays falling on any place,are the seasons of autumn and spring at thatplace. In June, the north pole of the earth inclines tothe sun, and brings all the northern parts into thelight; in these parts, therefore, it is summer. InDecember, when the earth is in the opposite partof its orbit, the north pole declines from the sun,and the south pole approaches it; and then it issummer to the parts south of the equator, andwinter to the north of it. In March and Septem-ber, the sun is perpendicular to the equator; andthen there is equal day and night at all places,except at the poles, which are the bou

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