???????? ??????? ?????? ???? ???????? ??????????? ??????? . ?????????? ?????? ?????????? ??????? ??? ???????? ??????? ?????????? ????? ????? ?????? ? ????????. ?????? ???? ???????? XIII ???????????? 1582 ???????? 24 ? ??????????. ??? ???? ?????? ?????? ??????????? ???????? ??? ???? ????????.

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• Inter Gravissimas, Gregory XIII's bull introducing the new calendar (Latin and French)
• Inter Gravissimas (Latin and French plus English)
• British Calendar Act 1751 Archived 2008-09-14 at the Wayback Machine
• Frequently Asked Questions about Calendars
• The Perpetual Calendar Gregorian Calendar adoption dates for many countries.
• Synoptical Julian - Gregorian calendar Compare Old and New Style dates 1582 - 2100.

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