New Year's Day is observed on January 1st, the first day of the year on the modern Gregorian calendar as well as the Julian calendar used in the Roman Empire. Traditionally, as a date in the Gregorian Calendar of Christendom, New Year's Day liturgically marked the Feast of the Circumcision of Christ, and is still observed as such in the Anglican Church and Lutheran Church. However, with most countries now using the Gregorian calendar as their main calendar, New Year's Day is the closest thing to being the world's only truly global public holiday, often celebrated with fireworks at the stroke of midnight as the new year starts.