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Updated: October 29, 2026
Even when he was far advanced into the vale of years, he evolved a divinely inspired theory concerning the period of the sun's revolution through the circle in which he moves in all his majesty. This theory, I may say, I have not only learned from books, but have also proved its truth by experiment. This theory Thales is said to have taught soon after its discovery to Mandraytus of Priene.