Lastly, in astronomy he is credited by Ptolemy with an explanation of the motion of the planets by a system of epicycles; he also made reseafches in the lunar theory, for which he is said to have been called Epsilon (e). [Please select]
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The theories of eccentrics and epicycles accomplished the end of explaining all the known phenomena. [Please select]
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But he combined with this determination a theory of epicycles and eccentrics which modern astronomy discards. [Please select]
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His thirty-four circles or epicycles comprised four for the earth, three for the moon, seven for Mercury (on account of his highly eccentric orbit) and five each for the other planets. [Please select]
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Excentric: As an alternative to epicycles, planets whose motion round the earth was not uniform could be represented as moving round a point some distance from the earth called the excentric. [Please select]
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