The elements of astronomy, physical and geometrical (1715)
Gregory, David, 1659-1708, Halley, Edmond, 1656-1742. Synopsis of the astronomy of comets, Adams, John, 1735-1826, former owner. BRL, Boston Public Library (John Adams Library) BRL · London : Printed for J. Nicholson ... and sold by J. Morphew ... · leaf 528
in another Retrograde, Let S be the Sun, [F/g-. 39.] about which twoPlanets revolve from D thro C towards By the Or-bit of the nearer P^r,* of the more diftant R 2 5the arcs defcribed bv them in equal fpaces ofrime AR, V B. Draw S R any how meetingthe nearer Orbit in P. Between S R and S? lee 5 M… … Book III. of AsTKOi^oM% 45^ i] equal Times are as their Velocities j and therefora-^R is to ?B, as SP to SM; wherefore ARh lefsthan PB, And it is plain that it is poffible for twoparallel right lines HADb, GRCg to be drawnthro^ and i?, fo as that the arc of the nearetOrbit intercepted by them, is…
Astronomy
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