Astronomy for the use of schools and academies (1882) (14760879621)

Identifier: astronomyforuseo00gill (find matches)

Title: Astronomy for the use of schools and academies

Year: 1882 (1880s)

Authors: Gillet, J. A. (Joseph Anthony), 1837-1908 Rolfe, W. J. (William James), 1827-1910

Subjects: Astronomy

Publisher: New York : Potter, Ainsworth, & Co.

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

Fig. 269. the planet is about six thousand miles, and from the surfaceless than four thousand. Astronomers on Mars, with tele-scopes and eyes like ours, could readily find out whether

Text Appearing After Image:

Fig. 270. this satellite is inhabited, the distance being less than one-sixtieth of that of our moon. It will be seen that Phobos makes about three revolutions ASTRONOMY. 24.I to one rotation of the planet. It will, of course, rise in thewest; though the sun, the stars, and the other satellite risein the east. Deimos makes a complete revolution in aboutthirty hours. III. THE ASTEROIDS. 244. BocWs Law of Planetary Distances. — There is ayery remarkable law connecting the distances of the planetsfrom the sun, which is generally known by the name ofBodes Law. Attention was drawn to it in 1778 by theastronomer Bode, but he was not really its author. To express this law we write the following series of num-bers : — o, 3, 6, 12, 24, 48, 96; each number, with the exception of the first, being doublethe one which precedes it. If we add 4 to each of thesenumbers, the series becomes —, 4, 7, 10, 16, 28, 52, 100;which series was known to Kepler. These numbers, withthe exception of 28, are

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1882

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