Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 146
f the perihelion, rep-resented by the angle n 8 E, E being thedirection of the vernal equinox fromwhich longitudes are counted. n, the mean angular motion of theplanet round the sun in a unit ot time.The actual motion being variable, themean motion is found by dividing thecircumference = 360° by… … 12(i ASTRONOMY. planetary orbits—that is, the proportions in which the orbits are flat-tened—is much less than their eccentricities. By the properties ofthe ellipse we have : 8 B ^ semi-major axis = a, B C = semi-minor axis = aVl — e,or, B G =a{\ — \ e^) nearly, when e is very small. The most…
Astronomy
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