Because people like opposite day and there had to be one day to be opposite day so people picked January 25th
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January 25 1981 was a Sunday.
January 25, 2020 falls on a Saturday.
January: I 25: XXV 2009: MMIX 2010: MMX
You've actually already answered your question. If you have a 25 day cycle then your period will start on day 1 and occur every 25 days!
Between January 27, 2010 and November 25, 2010 there are 302 days.