Ten weeks after stunning America and the world by winning the US election, Donald Trump will be sworn in as the 45th President of the United States.
He will replace Barack Obama in the White House, but not before a ceremony that dates back to George Washington.
The eyes of the world will be on Mr Trump as he takes the Oath of Office, and offers his inaugural address.
The Oath of Office
At noon local time (5 PM GMT) on January 20, Donald Trump will take the Oath of Office and be sworn in as America’s 45th president.
Chief Justice John Roberts of the US Supreme Court will administer the oath on the steps of the United States Capitol Building.
It will go something like this:
I Donald J Trump, do solemnly swear that I will faithfully execute the Office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States, so help me God
Mike Pence, the vice president-elect, will take the oath shortly before Mr Trump.
The inaugural address
After the swearing in, Mr Trump will give a speech that will, as all inaugural addresses are, be recorded in the pages of history.
In his second inaugural address, with the country emerging from devastating civil war, Abraham Lincoln proclaimed “malice toward none and charity for all”.
Franklin Roosevelt told a country ravaged by the Great Depression that all it had to fear was fear itself, and John F Kennedy urged Americans to “ask not what your country can do for you – ask what you can do for your country.”
Mr Trump will hope to follow in their footsteps. If he follows Mr Obama’s example, the speech will be about 20 minutes in length.
The pomp and circumstance
Prior to Mr Trump’s address there will probably be musical performances and words from religious leaders.
Afterwards, there will be a departure ceremony for Mr Obama as his family.
Mr Trump will then attend the traditional Congressional luncheon and take part in the inaugural parade.
His motorcade will travel down Pennsylvania Avenue from the Capitol to the White House, with well wishers and protesters lining the streets.
The White House handover
Barack Obama will wake up in the White House on the morning of January 20. That night, Donald Trump will go to sleep for the first time in his new home.
The White House changes hands almost as instantaneously as the presidency does.
While the inaugural ceremonies are underway, staff at the White House will be frantically moving out the remnants of the Obama administration, and preparing the residence and offices for their new inhabitants.