Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 114
equator, if free from any other in-fluence, would, in virtue of this, describe among thestars a small ellipse in a period comprising about eighteenand a half years; the longer axis of the ellipse beingabout 18-.5, and the shorter, 13. 7. The centre of theellipse lies in the circumference of the… … circumference, B, of the large circle, represents the patbthat the pole of the equator, P1 would describe aroundthe pole of the ecliptic, P, if precession alone existed; andA, is the small ellipse which P1 would describe if nutation Lunar. Within what period of time do the solar variations occur?…
Astronomy
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