While an estimated 800,000 people are expected to gather in Washington D.C. Monday to watch President Obama be sworn in for a second term, his second term officially begins Sunday. He will take his oath of office in a private ceremony. Vice President Joe Biden was sworn in on Sunday morning at the Naval Observatory.
-Obama will take the oath of office for a second term in a small ceremony in the Blue Room of the White House at 11:55 am. Chief Justice John Roberts will administer the oath.
-Obama will be sworn in using a Bible today that belonged to First Lady Michelle Obama's grandmother, LaVaughn Delores Robinson. The Robinson family Bible was a present from the first lady's father to his mother on Mother's Day in 1958, six years before Michelle's birth.
-Due to constitutionally-mandated scheduling, President Obama is set to become the second president in U.S. history to have four swearing-in ceremonies. Today will be his third. Obama was sworn in twice in 2008 out of an abundance of caution after Chief Justice John Roberts flubbed the oath of office.
Here is video of Obama's first swearing in by Roberts:
And Here is audio of Roberts administering the oath for a second time in 2009:
-Franklin Roosevelt was also sworn-in four times but, unlike Obama, he was elected four times.
-This year will mark the seventh time a president has taken the oath on a Sunday and then again on Monday for ceremonial purposes. Reagan last took the oath on a Sunday in 1985.
-Vice President Biden was sworn-in at the Vice President's residence at the Naval Observatory, surrounded by his family and close friends.
-Biden personally selected Associate Justice Sotomayor, who will be the first Hispanic and fourth female judge to administer an oath of office.
-Three women have previously sworn-in presidents and vice presidents: Judge Sarah T. Hughes swore-in President Johnson in 1963; Justice Sandra Day O'Connor swore-in Vice President Dan Quayle in 1989; and Justice Ruth Bader Ginsburg swore-in Vice President Al Gore in 1997.
-On Sunday and Monday, Vice President Biden will be sworn in using the Biden Family Bible, which is five inches thick, has a Celtic cross on the cover and has been in the Biden family since 1893. He used it every time he was sworn in as a US Senator and when he was sworn in as Vice President in 2009. His son Beau used it when he was sworn in as Delaware's attorney general.
Tune in to the ABC News.com Live page on Monday morning starting at 9:30 a.m. EST for all-day live streaming video coverage of Inauguration 2013: Barack Obama. Live coverage will also be available on the ABC News iPad App and mobile devices.