History of the planetary systems from Thales to Kepler (1906)
Dreyer, J. L. E. (John Louis Emil), 1852-1926 · Cambridge University Press · leaf 402
he vicarioustheory would give with sufficient accuracy for this purpose theheliocentric longitude, that is, the direction of the radius vector;it remained to determine its length. The line from perihelionto aphelion (IH) was therefore first divided unequally, so that^£ = 0-07232 and SC = 011332, 8… … Next, AS is bisected in B and BP is drawn parallel to AM, sothat HBP is the mean anomaly, then a circle round B will givethe distance. On BP BM is marked off equal to the meandistance, then SM is the true length of the radius vector, andif we make SM = SM, then M (situated on the line SM)will be…
Astronomy -- History · Solar system
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