Pope Gregory XIII created the Easter calendar in 1582, which is still used today. Pope Gregory XIII set forth a new Easter schedule that emphasized prayer and fasting over celebration.
The Gregorian Calendar was named after him in recognition of his work on this important holiday. It’s celebrated on 24 February each year, just days before Palm Sunday commemorates Jesus’ entry into Jerusalem .
For Catholics, it’s also a time to remember the martyrs who have died for their faith – including Saint John Paul II and Saint Francis of Assisi . In addition to celebrating Easter with family and friends, take some time to reflect on its spiritual meaning too.

What Event Marks The Beginning Of The Gregorian Calendar?
Pope Gregory XIII declared Easter a day of solemnity in 1582, and since then it has been an important holiday on the Catholic calendar. Easter is celebrated with religious services, special foods and decorations.
It’s also a time to celebrate family and friends.
Easter
Easter is the first day of the Gregorian calendar and it marks the start of Springtime in the Northern Hemisphere. The holiday commemorates Jesus’ resurrection from death and celebrates his victory over sin and death.
Easter also celebrates springtime flowers, new life and a time to reflect on God’s love for humanity. Families usually celebrate Easter by participating in religious services or by eating traditional foods like ham or eggs.
In some countries, like Ireland, Christians also dye their hair green to commemorate St Patrick’s Day which falls on March 17th during Lent.
Pope Gregory XIII
The Gregorian calendar marks the beginning of the Christian era by Pope Gregory XIII in 1582. The new calendar replaced an old Roman one that had slowly been losing its accuracy over time.
It was a massive undertaking and required reform of many ecclesiastical rules and practices. One of the most significant changes made was to move Christmas from December 25th to January 6th so it would fall on a Sunday rather than during Pagan celebrations days like Saturnalia and Natalis Solis Invicti (the birthday of Jesus).
There are still some holidays on the old calendar, but they’re celebrated less frequently now thanks to changing cultural conventions.
Inter gravissimas
January 1st is the day that marks the beginning of the Gregorian Calendar, which is based on the Julian calendar. The Gregorian Calendar was designed to help ease confusion caused by changes in European countries’ religious holidays over time.
The main difference between the two calendars is that Christmas and Easter are shifted by about a month each year with respect to other Christian holidays. Other than these minor adjustments, both calendars track months and years exactly same way – meaning leap years occur every 4 years on average.
If you want to learn more about what happens when we switch from one calendar to another, read this article on HowTheDateFormatsWork.
24 February 1582
The Gregorian Calendar marks the beginning of the modern era with its 1582 establishment. It’s named after Pope Gregory XIII, who made the decision to adopt it as the official calendar in 1584.
The Julian Calendar, which had been in use up until then, was based on Julius Caesar’s time and wasn’t consistent with our current astronomical clock system. Many countries still use different calendars due to cultural or religious reasons; for example, China uses a lunar calendar.
The Gregorian Calendar is recognized around the world and is widely used for civil purposes such as dating and legal proceedings.
Calendar named after him
The Gregorian Calendar, named after Pope Gregory XIII, marks the beginning of the Julian calendar. It is based on the length of a year and not on phases of the moon like the Julian calendar.
This reform changed how Easter is celebrated around the world and it was adopted in 1582 by Holy Roman Emperor Rudolf II. There are some exceptions to this rule- for example, Greece still uses a lunar calendar.
Today, most countries use either Gregorian or Julian calendars – but there are still some that use older versions of both calendars.
To Recap
The Gregorian calendar is based on the Julian Calendar, which was introduced in 45 BC by Julius Caesar. The Gregorian Calendar replaced the Roman Republic’s system of using a lunar cycle to govern time.
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