Dudley Observatory, American Astronomical Society, American Institute of Physics · New York [etc.] American Institute of Physics [etc.] · leaf 42
„, B.. the vertices of the three triangles.The angles B^AJL. P>V\J,. I^A.Jl... 1^A.2BZ are known.Adopt A\C as the linear unit, and let A., be the point fromwhich the observations are made, while Al is the pointabout which the center of the epicycle rotates uniformly.Take C for the origin of a… … where p and u denote severally the mean and true anomalymeasured, as with Ptolemy, from the aphelion. In orderto have the rectangular coordinates of the point B, wesolve these equations, regarding ./• and y as the unknowns,and get tan fx 4- tan v sin (/* + v) II = taii/x — tan v2 tan fj. tan utan…
Astronomy
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