Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 288
how it is that, according toKeplers second law, equal areas are traversed in equaltimes. The direction of a body moving round another in acircular orbit is always at right angles to the line joining the two bodies. If theorbit be elliptical, thedirection is thus per-pendicular only at twopoints; i.… … What, if the centrifugal tendency were to cease ? 514. What is always the direc-tion of a body revolving round another in a circle? If the orbit be elliptical,where alone is the direction thus perpendicular ? With Fig. 107, explain the 282 UNIVERSAL GRAVITATION. JP is moving in the direction Pf,…
Astronomy
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