Adoption of the Gregorian calendar
When people first started keeping track of time, they used different calendars with different months and different ways of measuring the year. This meant that different parts of the world celebrated holidays and important events on different days.
In the 16th century, a group of people led by a man named Pope Gregory XIII wanted to create a new calendar that everyone would use. They looked at the old calendars and decided to make some changes.
The new calendar they created was called the Gregorian calendar, named after the Pope. It had 12 months just like before, but some of the months were longer or shorter than they used to be. They also added an extra day to some years to make sure that the calendar matched up with how long it takes the Earth to go around the sun.
The people who made the Gregorian calendar wanted everyone to start using it, but some countries didn't want to change. It took many years, but eventually most of the world switched to the Gregorian calendar. Today, it is the most commonly used calendar around the world.
In the 16th century, a group of people led by a man named Pope Gregory XIII wanted to create a new calendar that everyone would use. They looked at the old calendars and decided to make some changes.
The new calendar they created was called the Gregorian calendar, named after the Pope. It had 12 months just like before, but some of the months were longer or shorter than they used to be. They also added an extra day to some years to make sure that the calendar matched up with how long it takes the Earth to go around the sun.
The people who made the Gregorian calendar wanted everyone to start using it, but some countries didn't want to change. It took many years, but eventually most of the world switched to the Gregorian calendar. Today, it is the most commonly used calendar around the world.