Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 33
represented by supposing theEarth to be placed eccentrically in a circle whosecircumference was uniformly described by the Moon. Hediscovered that to represent the motion accurately theline corresponding to EA of the last diagram revolvesin a time which he fixed at 9 years. This is known asthe… … Diag. x. ANCIENT ASTRONOMY 23 ecliptic are not fixed but move round in a periodof 19 years. Thus in Diagram XI, if N1AM1B is theecliptic, and N1CM1D the Moons orbit; the anglesat Nx and M± were found to be 50; and the points Nx,
Astronomy
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-162-0.webp)
