I'm trying to pin down an algorithm for calculating when to start saying ותן טל ומטר in diaspora. (In Israel it begins 7 Cheshvan.) I've gotten that we need to know how many centuries passed since 1500 on the Gregorian calendar, but I'm confused how to factor in the fact that three years every 400 years was treated differently.
How would you calculate Tekufat Tishri for any given year?
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