THE QUESTION:

Why is January 1st New Year’s Day?

THE RELIGION GUY’S ANSWER:

There’s a religious angle here, as with almost any major aspect of human culture past and present. Our January 1 observance stems from ancient paganism. The numbering of “2021,” as with every year, reflects the global reach of Christianity. And the specific day everyone reckons to be January 1 was fixed by the Catholic Church during the Reformation and Counter-Reformation hostilities.

Alongside this conventional calendar, many faiths observe their own religious new years by calculations apart from the January 1 tradition.

The perpetually valuable Encyclopaedia Britannica tells us that worship of the Roman god Janus, with his festival (on January 9th, not the 1st) in the month eventually named for him was practiced even before the legendary founding of the city of Rome in 753 B.C. Janus was the animistic divinity of doorways (januae) and archways (jani). The idea of auspicious entrances and exits, endings and beginnings, eventually applied to turn of the year. January 1 officially replaced March 1 as the start of Rome’s year in 153 B.C..

Due to this pagan background, much of Christian Europe came to reject January 1 observances and celebrated the new year on Christmas Day or March 25, the feast of the Annunciation (the angel Gabriel’s message to Mary that she would bear the divine Son).

The year is the length of time the earth makes one circuit around the sun, but the day upon which a year begins is an arbitrary choice. In 46 B.C., Julius Caesar kept Rome’s January 1 starting point but reworked the “Julian calendar” to better fit with astronomy. The Julian system gained widespread use all the way until A.D. 1582, when Pope Gregory XIII ordered the “Gregorian calendar” cleanup that is universal today.

The Julian system figured that a year lasts roughly 365 days plus 1/4 of a day, so it added one day in the “leap year” every four years.