Man sieht als äußere Bahn den Planeten Saturn vom Jahr 1708 bis ins Jahr 1737 nach der Epizyklentheorie. In der Mitte liegt die Erde. Sehr viel einfacher ist die Annahme der Sonne in der Bahnmitte und von Ellipsenbahnen um diese Mitte.
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- Man sieht als äußere Bahn den Planeten Saturn vom Jahr 1708 bis ins Jahr 1737 nach der Epizyklentheorie. In der Mitte liegt die Erde. Sehr viel einfacher ist die Annahme der Sonne in der Bahnmitte und von Ellipsenbahnen um diese Mitte.
- Originalbeschriftung: Fig. 49- The ancients assumed that the planets moved in exact circles, and, in fact, that all motion in the heavens was circular, the circle being the simplest and most perfect curve. To account for the loops described by the planets,they imagined that each planet revolved in a circle around acentre, which, in turn, revolved in a circle around the earth. The circle described by this centre around the earth they called the cycle, and the circle described by the planet around this centre they called the epicycle.
- The Eccentric. — The ancients assumed that theplanets moved at a uniform rate in describing the epicycle,and also the centre in describing the cycle. They had, however, discovered that the planets advance eastward morerapidly in some parts of their orbits than in others. Fig. 5°- account for this they assumed that the cycles described by the centre, around which the planets revolved, were eccentric ; that is to say. that the earth was not at the centre of the cycle, but some distance away from it. as shownin Fig. 51. E is the position of the earth...
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