Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 111
thout precession. Now, since these motionsco-exist, it is evident that neither a perfect circle nor acomplete ellipse will be described by the pole, P1; butat one time it will be outside the circumference, B, andat another within, revolving about P all the while. Itwill, therefore, actually… … NUTATION. 171. The influence of the moon in producing nuta-tion is to that of the sun, as five to seven. 172. Obliquity of the Ecliptic Affected by Nu-tation. It is evident from an inspection of the abovefigure that the pole of the equator approaches to and re-cedes from the pole of the ecliptic at…
Astronomy
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