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17 January

From Kook Science

17 January (the Seventeenth of January, January 17th, &c.) is the seventeenth 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 17 January is followed by either 348 days or 349 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 18 January and the date that precedes it is 16 January.

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

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