Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 103
PRECESSION EXPLAINED. P1 is always at the same distance from P revolving as itdoes in a circle about P. 148. The following illustration may tend still further FIG. 32 … w PRECESSION EXPLAINED. to elucidate this subject. Take a tumbler DC, Fig. 32,partly filled with water. The level surface of the water, Illustrate the subject still further by the aid of Fig. 32. 96 THE EARTH VIEWED ASTRONOMICALLY. EF, we will call the plane of the ecliptic, and the end Aof a…
Astronomy
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