Civilizations around the world have been celebrating the start of each new year for at least four millennia. Today, most New Year’s festivities begin on December 31 (New Year’s Eve), the last day of the Gregorian calendar, and continue into the early hours of January 1 (New Year’s Day).

Common traditions include attending parties, eating special New Year’s foods, making resolutions for the new year, and watching fireworks displays. The earliest recorded festivities in honor of a new year’s arrival date back some 4,000 years to ancient Babylon. For the Babylonians, the first new moon following the vernal equinox—the day in late March with an equal amount of sunlight and darkness—heralded the start of a new year. They marked the occasion with a massive religious festival called Akitu (derived from the Sumerian word for barley, which was cut in the spring) that involved a different ritual on each of its 11 days.

This content is adapted from History.com's, "New Year's."