Historical Organization
Catholic Church
Catholic Church
Details
Organization Timeline
Gregorian calendar reform is proclaimed
📅 24 February 1582Pope Gregory XIII issued the bull Inter gravissimas. It reformed leap-year rules to bring the civil calendar closer to the solar year.
Calendar mathematics reshapes civil time
📅 24 February 1582The reform used astronomical calculation and a revised leap-year cycle to limit the drift of the equinox through the calendar.
A papal decree standardizes a mathematical system
📅 24 February 1582The calendar illustrates how numerical models become social institutions through political and religious authority.
Calendar reform spreads unevenly across the world
📅 24 February 1582Catholic states adopted the reform first, while other societies accepted, adapted or resisted it at different times; calendar history was not a single global switch.
The Commune decrees the separation of church and state
📅 3 April 1871The Commune ended state financial support for religious institutions and declared religion a private matter. The policy became an important precedent for later French secularism.
Archbishop Darboy and other hostages are executed
📅 24 May 1871Communard officials executed Archbishop Georges Darboy and several other hostages in La Roquette prison while government forces carried out mass executions of captured Communards.