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Updated: May 8, 2025
As new irregularities of motion of the sun, moon, and planetary bodies were pointed out, new epicycles were invented.
It must be kept in mind throughout any careful study of his theory, that it was an hypothesis framed to remove difficulties connected with older systems; that he sought to bring conceptions of the universe into harmony with reason, instead of giving way to impressions made by the senses, or to the authority of world-honored teachers, either in other days or in his own; nor can we omit adding that, while he found fault with the Ptolemaic cycles and epicycles, he constructed similar devices of his own.
It was gravely said by some of the prelates in the Council of Trent, where the doctrine of the Schoolmen bare great sway, that the Schoolmen were like astronomers, which did feign eccentrics and epicycles, and such engines of orbs, to save the phenomena; though they knew there were no such things; and in like manner, that the Schoolmen had framed a number of subtle and intricate axioms, and theorems, to save the practice of the church.
'It was gravely said, Bacon tells us, 'by some of the prelates in the Council of Trent, where the doctrines of the Schoolmen have great sway; that the schoolmen were like Astronomers, which did faigne Eccentricks and Epicycles and Engines of Orbs to save the Phenomena; though they know there were no such Things; and in like manner that the Schoolmen had framed a number of subtile and intricate Axioms and Theorems, to save the practice of the Church. This is true of much else besides scholastic axioms and theorems.
To him also must be attributed the establishment of the theory of epicycles and eccentrics, a geometrical conception for the purpose of resolving the apparent motions of the heavenly bodies, on the principle of circular movement. In the case of the sun and moon, Hipparchus succeeded in the application of that theory, and indicated that it might be adapted to the planets.
Having tried in vain to represent the motion of Mars by an uniform motion in a circular orbit, and by the cycles and epicycles with which Copernicus had endeavoured to explain the planetary inequalities, Kepler was led, after many fruitless speculations, to suppose the orbit of the planet to be oval; and, from his knowledge of the conic sections, he afterwards determined it to be an ellipse, with the sun placed in one of its foci.
Nobody seemed to dare to depart from this fetish of uniform angular motion and circular orbits until the insight, boldness, and independence of Johann Kepler opened up a new world of thought and of intellectual delight. While at work on the Rudolphine tables he used the old epicycles and deferents and excentrics, but he could not make theory agree with observation.
There is seen the surveyor of all arts and sciences Aristotle, to whom belongs all that is most excellent in doctrine, so far as relates to this passing sublunary world; there Ptolemy measures epicycles and eccentric apogees and the nodes of the planets by figures and numbers; there Paul reveals the mysteries; there his neighbour Dionysius arranges and distinguishes the hierarchies; there the virgin Carmentis reproduces in Latin characters all that Cadmus collected in Phoenician letters; there indeed opening our treasures and unfastening our purse-strings we scattered money with joyous heart and purchased inestimable books with mud and sand."
Whewell’s observation is true of the first alone. Considered as a mere description, the circular theory of the heavenly motions represents perfectly well their general features: and by adding epicycles without limit, those motions, even as now known to us, might be expressed with any degree of accuracy that might be required.
But we must content ourselves with referring to the theory of eccentrics and epicycles, as a further marked illustration of it.
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