The first page of the papal bull Inter Gravissimas Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. [1][2] The …

Oct 15, 2025 · The introduction of the Gregorian calendar in 1582 marked a revolutionary change in the teaching and recording of history. This event was realized through the papal bull "Inter …

Dec 15, 2025 · The Gregorian calendar is a solar dating system used by most of the world. It is named for Pope Gregory XIII, who issued the papal bull Inter gravissimas in 1582, announcing …

Aug 10, 2025 · The Gregorian calendar reform of 1582 didn’t just correct a mathematical error; it taught societies to coordinate. Every appointment, deadline, and holiday you keep is a faint …

1582: Introduction of the Gregorian Calendar Gregory XIII conducted a reform of the calendar through his bull Inter gravissimas, issued on 24 February 1582. The bull prescribed that the …

Between the 4th and 15th of October, 1582 Pope Gregory XIII introduced the new calendar by the apostolic letter Inter gravissimas, dated 24 February, 1582. In this paper I would like to …

The Gregorian calendar was officially introduced by Pope Gregory XIII through the papal bull Inter gravissimas on October 15, 1582. This reform not only corrected the calculation of leap years …

The reform of the calendar by Pope Gregory XIII, initiated in 1582, addressed significant discrepancies in the Julian calendar that had been in use since 46 BCE.

Sep 12, 2023 · After years of consultation and research, Pope Gregory XIII signed a papal bull in February 1582 promulgating the reformed calendar that came to be known as the Gregorian …

Mar 12, 2024 · The Gregorian calendar was first adopted in 1582 by Catholic countries, following a decree by Pope Gregory XIII. Adoption dates vary widely by country, with some Protestant …