Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 144
ion, rep-resented by the angle tt S E, E being thedirection of the vernal equinox from,which longitudes are counted. n, the mean angular motion of theplanet round the sun in a unit of time.The actual motion being variable, themean motion is found by dividing the Fig. 52. circumference = 360° by the… … 126 ^ ASTRONOMY. planetary orbits—that is, the proportions in which the orbits are flat-tened—is much less than their eccenPricities. By the properties ofthe ellipse we have : /S^ = semi-major axis = a, BG= semi-minor axis = aVl — e,or, BG=a(l — ^e^) nearly, when e is very small. The most eccentric…
Astronomy
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