Named for the famous Greek philosopher Thales of Miletus (c.625–547 B.C.). None of Thales’ writings has come down to us, but from Aristoteles {see planet  (6123)} we know that he was the first to suggest a single substratum (water) for the Universe. The correct prediction of the solar eclipse of −584 May 28 contributed considerably to his reputation as an astronomer. Thales’ significance, however, lies in the fact that he attempted to explain natural phenomena by causes within nature itself, rather than by caprices of anthropomorphic gods. He must be credited with at least five important geometrical theorems. (M 24766) _ _.