Showing posts with label Pope Gregory XIII. Show all posts
Showing posts with label Pope Gregory XIII. Show all posts

Saturday, January 1, 2022

Why January 1?

It seems obvious to Westerners that the new year should start on the first of January, which we then named New Year's Day. This is fairly arbitrary, however. If it is truly a "new year" why do we start it in the middle of winter? Why not in Spring when things truly seem "new"? Or, if you like another astronomical reason, why not after the winter solstice (usually 21-22 December) after which nights shorten and more light returns to our waking day?

The Romans named the first month starting after the winter solstice after Janus, the god of doorways, and therefore of openings and beginnings. His two-headed demeanor was appropriate for looking back at the old year and forward to the new. Roman consuls chose 1 January as the start of their term in office as of 153 BCE.

Not everyone was attached to the January date, however. The Babylonians celebrated their new year on the first new moon following the vernal equinox (the date on which night and day are of equal length in Spring). In Egypt, the new year started with the annual flooding of the Nile in Spring.

Christians in medieval Europe frequently used dates of religious significance, celebrating Christmas, or 25 March (the Feast of the Annunciation), which also coincided with the return of Spring, since it would have been shortly after the vernal equinox. It was Pope Gregory XIII who reestablished our modern New Year's Day in 1582, when he reformed the calendar.

Of course, we don't celebrate the start of the new year so much as we celebrate the end of the old year. Celebrations begin in the waning hours of the old year, on the final day of December, extend briefly into the hours of the new year, and then the celebrants usually fall asleep and spend the 1st of January recovering!

Wednesday, January 1, 2014

Changing the Year

[Notate bene: this post is based on one that originally appeared on 30 June 2012.]

Pope Paul III, as played by
Peter O'Toole in "The Tudors"
In 2012, June 30th had one extra second added to it. This is only the latest in a long list of calendar corrections. We'll avoid the modern arguments about what actually constitutes a "year" (a problem resolved by designer of the Jalali calendar) and go back to a simpler time.

Readers of this blog are probably familiar with the pope's work to "fix" the calendar when he realized that the Julian calendar was "off" by several days. Sure, the Julian took into account that a "year" is actually 365 and a quarter days, but it wasn't exactly a quarter-day off, and so adding a day every four years wasn't sufficient to even things out. Every 131 years, the solstices and equinoxes would be off by a day. This was a real problem for the Church, because over the centuries Easter started shifting to summer, rather than spring.

Pope Paul III (1468-1549) saw the problem and gathered several astronomers to develop reforms.* Then Paul III died, five popes came and went, and in 1572 Pope Gregory XIII was elected and found himself faced with a growing problem and several possible solutions. He mulled it over for a few years, and then declared to the world:
  • The Leap Day would move to after February 28 (it had been tucked in before February 25).
  • The date of Easter would be calculated differently.
  • A Leap Year that is divisible by 400 will not have a Leap Day.
  • Ten days needed to be omitted from the calendar, to bring it back into alignment with the solstices. Accordingly, in 1582, the day after Thursday, October the 4th, was Friday the 15th....and then everything was fine. Except when it isn't, like when we have to add an extra second here or there. (And can you imagine trying to explain to someone 1000 years ago that the year gained about 45 seconds every 10 millennia because the Earth's rotation was slowing?)
The 1582 change gave rise to a slight oddity for historians, because technically, every date prior to October 4th, 1582 is a Julian date, but also has a corresponding Gregorian date that is several days different. How you count it depends on whether you consider the date to be just a label given by those who were there at the time, or a certain number of days prior to the present day. Or it's important if you want to declare the anniversary of an event.

Anyway, the extra second was added just before midnight. You may not have noticed it, but you can say you lived at a time when a minute was 61 seconds long!

*Copernicus had dedicated his work De revolutionibus orbium coelestium [On the Revolutions of the Celestial Spheres] to Pope Paul III, hoping it would save him from potential hostility for his radical thoughts. Had Paul called him, Copernicus probably would have come running to join the team of calendar reformers; alas, he had died in 1542.

Tuesday, January 1, 2013

The New Year

Tying the start of a year to the season of spring makes perfect sense in agrarian cultures. The Romans started their year in spring for a long time, seeing March 25th as a logical "New Year's Day" because the days were clearly getting longer after that date.

The reason why they (and we) use the 25th of certain months instead of the 21st (when astronomically significant events like solstices and equinoxes take place), is because 4 days was the length of time it took for an observer without instruments to be certain that the seasons were, in fact, changing.

When Julius Caesar decided to reform the calendar in 45 BCE (adding a "leap day) each four years), he chose to start his new version on January 1. Named for Janus, the duo-visaged god of transitions and beginnings, it made sense to start a significant change at the start of his month. Friends would create good omens for the start of the year by giving each other token gifts of figs and honey, and wishing each other well for the coming year.

In the Middle Ages, the Church preferred to use a date of greater religious significance (Christian religion, that is, rather than Roman). March 25th (as The Annunciation) was sometimes used, and December 25th as Christmas, and March 1st (for convenience, since it could start a month and a year).

When Pope Gregory XIII reformed the calendar again,* he chose January 1st to be the official start of the year. He didn't cause the whole world to follow his lead. Most European countries had already settled on the "Julian solution" for the first day of the year.

Happy New Year.

*Technically, when he carried out the reforms planned by Pope Paul III.

Saturday, June 30, 2012

Changing Time

Since today will have one extra second added to it, I thought it would be a good time to talk about calendar corrections in history. We'll avoid the modern arguments about what actually constitutes a "year" and go back to a simpler time.

Readers of this blog are probably familiar with the pope's work to "fix" the calendar when he realized that the Julian calendar was "off" by several days. Sure, the Julian took into account that a "year" is actually 365 and a quarter days, but it wasn't exactly a quarter-day off, and so adding a day every four years wasn't sufficient to even things out. Every 131 years, the solstices and equinoxes would be off by a day. This was a real problem for the Church, because over the centuries Easter started shifting to summer, rather than spring.

Pope Paul III (1468-1549) saw the problem and gathered several astronomers to develop reforms.* Then Paul III died, five popes came and went, and in 1572 Pope Gregory XIII was elected and found himself faced with a growing problem and several possible solutions. He mulled it over for a few years, and then declared to the world:
  • The Leap Day would move to after February 28 (it had been tucked in before February 25).
  • The date of Easter would be calculated differently.
  • A Leap Year that is divisible by 400 will not have a Leap Day.
  • Ten days needed to be omitted from the calendar, to bring it back into alignment with the solstices. Accordingly, in 1582, the day after Thursday, October the 4th, was Friday the 15th.
...and then everything was fine. Except when it isn't, like when we have to add an extra second here or there. (And can you imagine trying to explain to someone 1000 years ago that the year gained about 45 seconds every 10 millenia because the Earth's rotation was slowing?)

The 1582 change gave rise to a slight oddity for historians, because technically, every date prior to October 4th, 1582 is a Julian date, but also has a corresponding Gregorian date that is several days different. How you count it depends on whether you consider the date to be just a label given by those who were there at the time, or a certain number of days prior to the present day. Or its important if you want to declare the anniversary of an event.

Anyway, enjoy your extra second; it will be added just before midnight, so feel free to stay up so you can say you remember the time when a minute was 61 seconds long!

*Copernicus had dedicated his work De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres) to Pope Paul III, hoping it would save him from potential hostility for his radical thoughts. Had Paul called, Copernicus probably would have come running to join the team of calendar reformers; alas, he had died in 1542.