RE
I don’t fully understand this minhag we have of repeating the same thing every year
“This year the Sept tekufa (Tekufas Tishri) is Sept 22 ”
This is not correct
Tekufas Tishrei according to Shmuel this year was Oct 7 at 3 PM*. 60 days later (starting with Fri Oct 7 as day #1**) gives you Monday Dec 5th as day #60. We start Vesein Tal umatar on Monday. Monday begins Sunday night Dec 4th.
* If for some reason you want to use the Julian Calendar, though I’m not sure why since it isn’t really in use today, then the Tekufa was Sep 24 (Oct 7 – 13 days = Sep 24) not Sep 22
** This mistake has been pointed out before, when counting Halachic days DAY # 1 is (almost?) always counted. A baby has his bris at eight days old. For a baby born today , if you ask some guy on the street when is he 8 days old ? They would likely say: “1 day old tomorrow Thurs, 2 day old Fri … 8 days old next Thursday” As you know they would be wrong, TODAY is day 1, tomorrow day 2 … Day 8 is next wed. Ditto for 7 days of sehva berachos, shiva, sheloshim etc day # 1 counts . Same thing here When counting 60 days the day of the tekufa is day #1