• Thumbnail for Inter gravissimas
    Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. The document, written in Latin...
    10 KB (1,351 words) - 15:49, 24 February 2024
  • world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification...
    73 KB (8,364 words) - 16:33, 21 March 2024
  • Thumbnail for Date of Easter
    Fleury in 988. The claim by the Catholic Church in the 1582 papal bull Inter gravissimas, which promulgated the Gregorian calendar, that it restored "the celebration...
    141 KB (13,105 words) - 17:15, 26 March 2024
  • Thumbnail for Adoption of the Gregorian calendar
    them. The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct an error in the Julian calendar that...
    48 KB (5,337 words) - 20:15, 11 February 2024
  • Thumbnail for 1582
    the beginning of the Gregorian calendar switch, when the papal bull Inter gravissimas introduced the Gregorian calendar, adopted by Spain, Portugal, the...
    21 KB (2,291 words) - 17:26, 25 March 2024
  • cycle. By 1582 it was noted (for example, in the text of the bull Inter gravissimas itself) that the new and full moons were at that point occurring "four...
    14 KB (1,711 words) - 20:14, 21 January 2024
  • Thumbnail for Easter
    Bruce McClure in Astronomy Essentials, 30 March 2018. Paragraph 7 of Inter gravissimas ISO.org Archived 14 July 2022 at the Wayback Machine to "the vernal...
    119 KB (12,034 words) - 10:25, 22 March 2024
  • Thumbnail for Aloysius Lilius
    the right moments the due adjustment is applied." The papal bull (Inter gravissimas) was issued on 24 February 1582 (year 1581 in Florentine Easter-based...
    8 KB (896 words) - 19:23, 29 February 2024
  • Thumbnail for Villa Mondragone
    Mondragone that in 1582, Gregory promulgated the document (the papal bull "Inter gravissimas") which initiated the reform of the calendar now in use and known...
    5 KB (555 words) - 06:59, 6 June 2023
  • Thumbnail for Pope Gregory XIII
    this phenomenon. Gregory subsequently decreed, by the papal bull Inter gravissimas of 24 February 1582, that the day after Thursday, 4 October 1582 would...
    20 KB (2,298 words) - 12:13, 26 March 2024