Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · Cambridge, University press · leaf 438
inclined to the earth's orbit, which is assumed to be circular, and the line of nodes coincides with the axis of the parabola. If T years be the time the comet takes to move from the vertex to the end of the latus rectum, prove that, whatever be the inclination of the orbits, when the comet appears… … = 2a cosec^ yjr cos yjr : tan (f). Fig. 110. Also V=sm yjfJ^ii/a, v=^, ST= sec (l> = a cosec^-\jr, whence eliminating yjr and reducing we have 2a = 2 sec <^ — sin^ (f), %^ i-Ji a^ 2 \/2 2 area SAL 2'= and 3 Vm because the year is the unit of time.
Spherical astronomy
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