Berry, Arthur,b. 1862 · London, J. Murray · leaf 366
any per-turbation of a planet, whether experienced in the courseof one revolution or in a longer time, by means of changes § 236] Variation of the Elements 303 in an elliptic orbit. For wherever a planet may be andwhatever (within certain limits *) be its speed or directionof motion some ellipse… … A varying ellipse. in an ellipse, which, however, is continually altering itsposition or other characteristics. Thus the problem ofdiscussing the planets motion becomes that of determiningthe elements of the ellipse which represents its motion atany time. Euler shewed further how, when the…
Astronomy
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