Yoshihide Kozai

Yoshihide Kozai (1 April 1928 – 5 February 2018) was a Japanese astronomer. He worked in celestial mechanics. He was best known for discovering the Kozai mechanism, for which he received the Imperial Prize of the Japan Academy in 1979.
From 1988 to 1991, he was the president of the International Astronomical Union.
In 2009, he won the Decoration of Cultural Merit from the Japanese government.
Kozai died on 5 February 2018 in Tokyo from liver failure, aged 89.