Why do we celebrate New Year's Day on January 1st?

AUSTIN (KXAN) - It comes every year like clockwork, literally: New Year's Day. Every culture on Earth celebrates the new year at some point. In the United States, we celebrate on January 1st. But why this day when there are so many other days that are appropriate?"Months of the year tend to be really arbitrary by culture," said University of Texas religious studies associate professor Brent Landau. "A really interesting feature of life on Earth is that we have these different seasons."
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