Who was.... Yuri Gagarin?

 A day on Venus (the period it takes to make one rotation) lasts 243 Earth days, while a year on Venus (the time it takes to rotate around the Sun) is slightly shorter at 224.7 Earth days.

Yuri Gagarin  

82% got this right

The Soviet pilot and cosmonaut orbited the Earth on the Vostok 1 spacecraft on April 12, 1961. Gagarin later became deputy training director of the Cosmonaut Training Centre outside Moscow, which was later named after him.