Plato, who considered the heavens to be divine, believed that the only motion appropriate for the heavens was uniform circular motion, and raised the question of how to explain the apparent irregularities of planetary motion, such as prograde, retrograde, and stationary motion, without deviating from the principle of uniform circular motion. The geometric theory of concentric spheres devised by Eudoxus and Callippus was an excellent answer to this problem. Later, Aristotle, based on the theory of concentric spheres, completed his cosmology as a hierarchically ordered cosmos. *Some of the terminology that mentions "Callippus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…天界を神的な存在としたプラトンは,天界にふさわしい唯一の運動は一様な円運動であり,惑星の順行,逆行,留等のみかけの不規則性をこの一様円運動の原則から逸脱せずにいかに説明するかという問題を提起した。エウドクソスとカリッポスが考案した幾何学的な同心天球説はこの問題提起に対する一つのみごとな解答であった。その後アリストテレスは同心天球説に依拠しながら,階層構造的に秩序づけられたコスモスとしての宇宙論を完成させた。… ※「カリッポス」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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