Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 44
is accounted for at once by Copernicus. Themovement of Jupiter, for example, is represented inDiagram IX by a movement of I round E (the Earth)in twelve years, w<hile J (Jupiter) moves round I in oneyear. Diagram XVIIIshows how this would berepresented on the Coper-nican system. S is theSun; E,… … 34 ASTRONOMY SE, then the points I and J bear the same relation toE as in the Ptolemaic diagram, for EI and IJ areequal in length and in the same directions in the twodiagrams. Thus in the Copernican system the ap-parent motion of Jupiter relatively to the Earth, oras seen from the Earth, is shown…
Astronomy
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