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Where does Rashi say that Jews will be revered for knowledge of astronomy?

I remember reading a Rashi that says that the Jews will be revered for their knowledge of the stars. What's the location of this Rashi?
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Counting years according to the solar calendar

I once heard there is an opinion in Rishonim (maybe Gaonim?) that says we count ones years of life according to the solar calender. So for example a boy would become bar mitzvah when he would turn 13 ...