Inauguration Day occurs every four years on January 20 or January 21 if January 20 falls on a Sunday.

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The ceremony takes place at the US Capitol in Washington, D.C., and includes the swearing-in of both the president-elect and the vice president-elect.

The vice president-elect is traditionally sworn in first, taking an oath that has been in use since 1884—the same one taken by senators, representatives, and other federal officials. Around noon, the president-elect takes the oath of office, as prescribed by Article II, Section I of the U.S. Constitution.

Also Read: How did blue become Democrat and red become Republican?Until 1937, the presidential term began on March 4. If a vice president assumes the presidency due to the death or resignation of a sitting president, the oath of office is administered immediately to ensure a seamless continuation of government. To date, nine vice presidents have taken office under such circumstances.