Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · Cambridge, University press · leaf 184
ot in general be a minimum when the planet is in opposition unless the earth is at one or other of two points in her orbit, but that if the perihelia of the two orbits have the same heliocentric longitude and the latera recta are in the duplicate ratio of the eccentricities, the distance will be a… … whence Fia. 57. PP cos P'PN= PP COS {(t>- d + a>)= -dr cos {d-a) + rd0 sin (^ - a>) = {-eain{d - -or) coa (d - a>)l'Jp + "Jp sin {6 - a>)lr) s] ^ dt . = {e sin (or - ii>)j>lp + sin {6 - a>)j-Jp} sfjldt. If therefore PQ=Pq we must have e sin (ot - (o)l>/p +ain {6 - a,)l>lp=e' sin (ot' - ai)j^p' +…
Spherical astronomy
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
