On the contrary, Rambam says that Chazal went according to the scientific knowledge of their time and that this is proper so long as it is accepted scientifically (Moreh Nevuchim 3:14 at the end, Hilchot Kidush HaChodesh 1:24)although for halachic purposes it might not make a difference (Hilchot Shechita 10:12-13).
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