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In the US we usually start asking for rain in the amida on the fourth of December at night. The halacha states that this is on the sixtieth days of tekufat Tishri (the fall season). But the fall season falls usually around September twenty one. There is a difference of about two weeks. Why?

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  • Related question that might help: judaism.stackexchange.com/questions/11985/…
    – yydl
    Sep 30, 2020 at 2:16
  • amazon.com.au/… has a chapter on this, as far as I remember.
    – The GRAPKE
    Sep 30, 2020 at 2:29
  • Maybe this will help
    – robev
    Sep 30, 2020 at 2:48
  • @yydl or judaism.stackexchange.com/a/98187/759
    – Double AA
    Sep 30, 2020 at 2:50
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    @robev The calendar used is basically the Julian calendar which has three extra leap years every 400 years. As an example, when the switch was made in England, 15 days were removed from the calendar. Thus when the Gregorian calendar skips a leap year (years divided by 100 but not 400 at the end of each century) the discrepancy grows by one day. Thus, this century had a leap year in 2000 but skipped in 1900 and will skip again in 2100. Sep 30, 2020 at 3:38

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