Because people like opposite day and there had to be one day to be opposite day so people picked January 25th
January 25 1981 was a Sunday.
January 25, 2020 falls on a Saturday.
January: I 25: XXV 2009: MMIX 2010: MMX
Between January 27, 2010 and November 25, 2010 there are 302 days.
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!
There is no such thing as opposite day! YES IT IS! OPPOSITE DAY IS ON JANUARY 25
Opposite Day in 2012 fell on January 25th. It is typically observed on January 25th each year.
January 25 1971 was a Monday.
January 25, 1997 was a Saturday.
25 January 2002 was a Friday.
25 January 1874 was a Sunday.
25 January 1943 was a Monday.
January 25 1955 was a Tuesday.
January 25, 1996 was a Thursday.
January 25 2010 was a Monday.
January 25, 1968 was a Thursday.
January 25 1981 was a Sunday.