The idea of aethereal spheres moving with natural circular motion led to Aristotle's explanation of the observed orbits of stars and planets in perfectly circular motion. Aristotle also noted that celestial spheres made of aether held the stars and planets. Aether naturally moved in circles, and had no contrary, or unnatural, motion.
Īether differed from the four terrestrial elements it was incapable of motion of quality or motion of quantity. With this addition the system of elements was extended to five and later commentators started referring to the new first one as the fifth and also called it aether, a word that Aristotle had not used. It was neither hot nor cold, neither wet nor dry. The first element however, located in the celestial regions and heavenly bodies, moved circularly and had none of the qualities the terrestrial classical elements had. He noted that the four terrestrial classical elements were subject to change and naturally moved linearly. However, in his Book On the Heavens he introduced a new "first" element to the system of the classical elements of Ionian philosophy. Aristotle, who had been Plato's student at the Academy, agreed on this point with his former mentor, emphasizing additionally that fire has sometimes been mistaken for aether. In Plato's Timaeus (58d) speaking about air, Plato mentions that "there is the most translucent kind which is called by the name of aether (αἰθήρ)" but otherwise he adopted the classical system of four elements. The innermost spheres are the terrestrial spheres, while the outer are made of aether and contain the celestial bodies. Please for any further information required.Medieval concept of the cosmos. We are unable to redirect orders after items have been dispatched and we cannot refund or replace items that are tracked as being delivered. Please provide Natasha Schweitzer with correct shipping/delivery information as we will not be held responsible for incorrectly entered addresses or an address that is not recognised by Australia Post or International Registered Post. The above delivery times are estimates only and Natasha Schweitzer cannot be accountable for late deliveries. Prices do not include overseas custom duties or taxes that may incur. All international purchases are exempt from Australian taxes. Please contact if you wish to have these added. Extra insurance can be added upon request with additional charges.
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