January 19, 1966 – Indira Gandhi becomes India's first female prime minister
She was assassinated on October 31, 1984.

January 20, 2009 – Barack Obama sworn in
He became U.S. President for the second time in a row.

January 21, 1976 – Concorde takes off on its first scheduled flights
Two of the supersonic aircraft took off from Paris and London simultaneously.

January 22, 1943 – World record for fastest temperature change
The fastest temperature change recorded in history occurred on this day in Spearfish, South Dakota. The temperature increased from _4°F (_20°C) to +45°F (+7°C) in the span of two minutes. 

January 23, 1556 – The deadliest earthquake on record kills some 830,000 people
The epicenter was in the Wei River Valley in Shaanxi Province, China.

January 24, 1984 – The Apple Macintosh computer goes on sale
The “Mac” was the first commercially successful personal computer using a graphical user interface and a mouse.

January 25, 1977 – The world's first solar power plant is opened

The solar furnace in Odeillo, France was the first power plant providing alternative energy.