Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 110
he 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… … NUTATION. circumference, B, of the large circle, represents the paththat the pole of the equator, Pl 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 solnr…
Astronomy
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