The elements of natural and experimental philosophy .. (1834)
Phillips, R. (Richard), Sir, 1767-1840, Smith, E. A · New York, M'Elrath, Bangs & Herbert · leaf 227
rthest from it when in the extremity Aof the greater axis, most distant from the focus S, in which theSun is ; and nearest to it when in P, Fig. 77. The point A is termed the Higher Apsis, or the Aphelion; andthe point P, the Lower Apsis, or the Perihelion. These pointsare constantly varying, and… … The distance between the centreof the ellipse C, and the Sun orfocus S, is called Eccentricity. The greater axis A P, is the Lineof Apsides. The straight line S E, drawnfrom the extremity of the less axisE C to the Sun, is the Mean Dis-tance of the planet from the Sun. The mean distance added to…
Physics
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