* Astronomy

Sergei Avdeyev (born 1 January 1956) is a Russian engineer and cosmonaut.
He retired as a cosmonaut on 14 February 2003. 
Avdeyev at one point held the record for cumulative time spent in space with 747.59 days in earth orbit, accumulated through three tours of duty aboard the Mir Space Station. He has orbited the earth 11,968 times travelling about 515,000,000 kilometres.
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