Storiascopio · Era 9 of 12 · lower secondary year 2
The Gregorian calendar
1582 · Rome, Italy
In short
The Julian calendar, used since the time of Julius Caesar, was a little longer than the real year: over the centuries it had fallen ten days behind the seasons. Pope Gregory XIII decided to correct it, following the method of the Calabrian doctor Luigi Lilio. To put things right, in 1582 the calendar jumped straight from 4 to 15 October. The rule for leap years changed too: years at the end of a century are leap years only if they can be divided by 400.
Why it matters It is the calendar we still use today in almost the whole world.
Source: Treccani, entry “Calendario”
Where we are in the era “Early modern age”
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about 1420Event 17 of 251687
Your turn
Name ______________________ Class ______ Date __________
When did it happen? Find the date at the top and write it here:
Tell it in your own words: what happened?
Draw the scene below.
storiascopio.com/en/event/the-gregorian-calendar/ · free worksheet, you may photocopy it for your class