Starting with President Regan, the inauguration has taken place on the Capitol's West Front overlooking the monuments. Prior to Regan, the traditional location was the other side of the Capitol. The location did change occasionally for bad weather or other special circumstances.
Oath of Office
All US presidents take the oath of office, starting with the first president, George Washington.
James MonroeThe first president to take the oath was George Washington.
President Obama swore the oath of office on Abraham Lincoln's Bible.
Yes- the President must take the oath of office as required by the US Constitution.
Joe Biden would serve as the President and therefore take the oath of office in the case the Obama did not.
April
First he has to be legally elected as President or else become president by succession. Second he must be "sworn in" by taking the oath of office before a person who is legally qualified to administer oaths.
I think the president becomes official at NOON the day of inauguration, whether he takes the oath or not.
The constitution requires that before a President can assume their duties they have to take the oath of office. The oath is administered at the official ceremony, the inauguration. When the incoming President speaks the final words of the oath, their Presidency begins and the former President's term in office is officially over.
at noon
because it is a tradition and custom