Inter Gravissimas - Date

Date

The version of "Inter gravissimas" included by Christoph Clavius in his work explaining the Gregorian calendar contained these dating clauses: "Anno Incarnationis Dominicae M. D. LXXXI. Sexto Calend. Martij, Pontificatus nostri Anno Decimo. ... Anno à Natiuitate Domini nostri Iesu Christi Millesimo Quingentesimo Octuagesimo secundo Indictione decima,". These clauses include four years:

  • "Anno Incarnationis Dominicae M. D. LXXXI." (In the year of the Incarnation of the Lord 1581) is the year beginning March 25, 1581. March 25 is the traditional date of the conception, annunciation, and incarnation of Jesus.
  • "Pontificatus nostri Anno Decimo" (In the tenth year of our pontificate) is the year beginning May 13, 1581. Gregory XIII was elected pope on May 13, 1572 (in terms of the Julian calendar).
  • "Anno à Natiuitate Domini nostri Iesu Christi Millesimo Quingentesimo Octuagesimo secundo" (In the year from the Nativity of our Lord Jesus Christ 1582) is the year beginning December 25, 1581 using the modern January 1 beginning of the year. It marks the beginning of year 1582 if that year began on December 25, the traditional date of the birth or nativity of Jesus.
  • "Indictione decima" (Indiction 10) is the year beginning January 1, which agrees with modern reckoning.

All of these years agree that the bull was dated February 24, 1582, using the modern January 1 beginning of the year.

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