IAC White Set Science Bee Practice Test

Rotational direction and speed determine how long a day lasts. Venus spins in the opposite direction from most planets (a retrograde rotation), so the Sun would rise in the west and set in the east. It also spins very slowly—about 243 Earth days to complete one rotation. That combination makes a day on Venus extremely long, longer than its year. So Venus fits the description of having a retrograde rotation and a very long day. The other planets listed rotate in the usual prograde direction and have much shorter days, so they don’t share both features.