20 January

This year

• 2025: Donald Trump starts his second term as POTUS (47th).

In History

• 1942: Wannsee Conference.

Also the US presidential inaugurations of:

1. 1953: Dwight D. Eisenhower (34th & 1st on this date)
2. 1961: John F. Kennedy (35th)
3. 2009: Barack Obama (44th)
4. 2017: Donald Trump (45th)
5. 2021: Joe Biden (46th)

Birthdays

• 1716: Charles III of Spain.
• 1775: André-Marie Ampère.