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With the papal bull Inter gravissimas, Pope Gregory XIII announces the Gregorian calendar.
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Papal bull
Type of decree by the Catholic pope
A papal bull is a type of public decree, letters patent, or charter issued by the pope of the Catholic Church. It is named after the leaden seal (bulla) traditionally appended to authenticate it.Source: Wikipedia (CC BY-SA)
Inter gravissimas
Papal document that established the Gregorian calendar
Inter gravissimas was a papal bull issued by Pope Gregory XIII on 24 February 1582. The document, written in Latin, reformed the Julian calendar. The reform has conventionally come to be regarded as a new calendar in its own right, called the Gregorian calendar, named after Pope…Source: Wikipedia (CC BY-SA)
Pope Gregory XIII
Head of the Catholic Church from 1572 to 1585
Pope Gregory XIII was head of the Catholic Church and ruler of the Papal States from 13 May 1572 to his death in April 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally accepted civil calendar to this…Source: Wikipedia (CC BY-SA)
Gregorian calendar
Internationally accepted civil calendar
The Gregorian calendar is the calendar used in most parts of the 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 of, and replacement for, the Julian calendar. The principal…Source: Wikipedia (CC BY-SA)
February 24
Day of the year
February 24 is the 55th day of the year in the Gregorian calendar; 310 days remain until the end of the year.Source: Wikipedia (CC BY-SA)