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- GREEK PHILOSOPHER PYTHAGORAS: 6th century BC
-
- Pythagoras stated in his "Harmony of the Spheres" that
- the universe was a giant sphere which encompassed the
- Earth and the air around it:
-
- "The Sun, Moon, and planets revolve in concentric
- circles, each fastened to a sphere or wheel. The
- swift revolution of each of these bodies causes a
- swish, or musical hum, in the air. Evidently each
- planet will hum on a different pitch, depending on
- the ratios of their respective orbits--just as the
- tone of a string depends upon its length. Thus the
- orbits in which the planets move form a kind of
- huge lyre whose strings are curved in circles."
-