January 1 marks the first day of the new year according to the Gregorian calendar, which is the most widely used calendar across the globe. The arrival of January 1 is a cause for celebration in many countries, but the first day of the year has also played host to its fair share of history. This year, New Year’s revelers might want to reflect on some of the more notable events that have taken place on January 1 as they pop some champagne corks and count down to the dawn of 2018.