Inauguration Day is the day on which the President of the United States is sworn in and takes office. It was originally held every four years on March 4 except the first inauguration for George Washington, which was held on April 30, 1789. The ratification of the Twentieth Amendment to the United States Constitution changed the beginning of the President and Vice President's terms to noon on January 20th, beginning with Franklin Roosevelt's second term in 1937. The next Inauguration Day will occur on January 20, 2009.

Presidential Inaugural Committee

List of United States presidential inaugurations