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15 January

From Kook Science

15 January (the Fifteenth of January, January 15th, &c.) is the fifteenth day of the year under the Gregorian calendar, as first promulgated by Pope Gregory XIII, Bishop of Rome, in 1582 A.D., as well as the earlier Julian calendar, as first promulgated by Julius Caesar in 45 B.C. The date of 15 January is followed by either 350 days or 351 days during leap years, which are calculated differently in Gregorian and Julian calendars; in both calendars, regardless of its leap year status, the date that follows is 16 January and the date that precedes it is 14 January.

Note that for the purposes of the following indices, the Gregorian date trumps the Julian date, unless otherwise indicated.

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