On This Day - 4 October 1582 - The Gregorian Calendar Was Adopted

The date, the 4th of October 1582 –

On this day, Pope Gregory the 13th initiated the Gregorian Calendar.

Today the Gregorian Calendar, also sometimes referred to as the Christian Calendar, is the most widely used in the world. Before the Gregorian calendar was adopted, much of the Christian World used the Julian Calendar, which had been in use 45 years before Christ.

Christian leaders wanted to keep Easter tied to spring, however began to see a drift in Easter’s placement due to its date being governed by the vernal equinox, and the Julian calendar’s gaining of one day on the tropical, or solar year, every 128 years.

Although the Julian calendar uses a leap year system very much like the Gregorian calendar, the Gregorian system omits a leap year – a year with an extra day occurring every four years, every four hundred years. The Julian calendar averages out as being 365.25 days long – which is actually several minutes longer than the tropical calendar. In comparison the Gregorian calendar is on average 365.2425 days long. This minute difference means that instead of gaining an extra day, in comparison to the tropical year, every 128 years, the Gregorian calendar gains a day only every 3 226 years.

As well as being 10 minutes and 48 seconds shorter than the Julian Calendar, the Gregorian calendar also skipped 10 days to compensate for calendar to tropical calendar drift, meaning Thursday the 4th of October 1582, was followed by Friday, 15th October 1582.

Although named the Gregorian Calendar, after then Pope Gregory 14th, the reforms were largely based on modifications suggested by Aloysius Lilius, and authored by he and Christopher Clavius. The calendar was at first adopted only be Catholic countries, but went on become common use in Protestant countries too, and later by almost every country in the world.

Everything becomes history. I’m Wilfred Cunningham, until next time, goodbye.

Sources:

Out Of This World - Fine Books Magazine

Introduction To Calendars - US Navy

Chritsopher Clavius - New Advent

Gregorian Calendar - Wikipedia

[xxxkinggeorgexxx]

POV: you’re here after watching that tiktok video

[Jean-PierreGrenier-ylwp]

Many Orthodox churches still use the Julian calendar for their liturgy. So, even though they celebrate Christmas on their December 25, it lands on our January 7 - which represents the 13 days of drifting now accumulated.

[pentelegomenon]

Interestingly the Gregorian calendar could have been more accurate, but instead chose to be as simple and unobtrusive as possible. However, they were assuming that counting large amounts of years is not obtrusive, which I don't agree with. Did you know that if you count a year as 52 weeks, but move the "first day of the week" one ahead on every 42nd Sunday, it will be twice as accurate as the Gregorian calendar? And 52 is divisible by 4, perfect for the 4 seasons.

[cccherriii_]

Did you guys know that when we got this calendar in the 1500’s we lost 8 years in the translation so basically it’s no 2020 it’s 2012

[TammyLetterman]

Wondering what would my birthday be if I went by the original calendar?

[youafruitcup]

Does this mean that 2020 is really 2012??

[puterboy]

Have we lost eight years in translation?

[NewTrafford]

Ethiopia does not use or follow the gregorian calendar, instead we have our own. There are 13 months in a year and we are in the year 2012 now.

[Gayboy]

How did people back then know a year was 365 days

[Aston]

They said we lost 8 years during this so this means 2020 is actually 2012 which is a bad year

[holdingpattern]

What's strange about the Gregorian calendar is that it's a clearly suboptimal calculation. It went with the scheme of skipping 3 leap years every 400 years, based on the assumption that 400 years was fairly easy to calculate, which it is; but skipping 4 leap years every 500 years is significantly easier to calculate, and also deviates from the tropical year at about half the speed.

[MatrixMaster]

From and including: Sunday, January 1, 2006
To, but not including Sunday, October 7, 2018

Result: 4662 days
It is 4662 days from the start date to the end date, but not including the end date

Or 12 years, 9 months, 6 days excluding the end date

[sideeggunnecessary]

When did Japan adopt the Gregorian calendar?

[jaywray.]

It's actually 2022 but you were close

[RyanSauvageau-ts]

When was the letter J (I) incorporated??? 🤔

[jackmorgan]

So scientist agree enough with Christian faith to have their timeline baised on when the Christian savior lived? Seems like deep down all scientist know there is a God, or are they just cognitive dissonance atheist?

[creativevirgo]

Clean & matter of fact speak ( clean meaning sans mouth slurping umming and other annoying extraneous yucky sounds) . THANK YOU.😘

[dailymchugher]

0:55 ERROR : omits a leap year every 400 yrs SHOULD BE omits 3 leap yearS every 400

[harihara]

Go by the Hindu from panchang for date of birth it is based on positions of sun planets and the longitude and latitude of the spot of birth. It will be different for different years.

[SRTMustangKiller]

It wasn’t adopted, it was enforced by death if you didn’t agree.