February 23: National Day in Brunei (1984); Defender of the Fatherland Day in Russia and several other former Soviet republics
Supernova SN1987A
- 1885 – Sino-French War: France gained an important victory in the Battle of Đồng Đăng in the Tonkin region of what is now Vietnam.
- 1927 – German theoretical physicist Werner Heisenberg wrote a letter to fellow physicist Wolfgang Pauli in which he described his uncertainty principle for the first time.
- 1941 – Plutonium was first chemically identified by chemist Glenn T. Seaborg and his team at the University of California, Berkeley.
- 1987 – Light from the supernova SN 1987A (remnant pictured) in the Large Magellanic Cloud reached the Earth.
- 2007 – A Virgin Trains Pendolino express train from London Euston to Glasgow Central derailed near Grayrigg, Cumbria, UK, killing one person and injuring 22.
- More anniversaries:
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