The Solar System

Why is a Venus day longer than a Venus year?
Answered by Science Channel
  • Science Channel

    Science Channel

  1. Yes, you read that right -- a day on the planet Venus is longer than a year there. Unlike planet Earth, it actually takes longer for Venus to rotate on its own axis (representing the cycle of a day) than it does for it to revolve around the sun (representing the cycle of a year). How is this measured? According to our measurement of time, it takes no less than 243 days (of Earth time) for Venus to finish one rotation on its axis, whereas it takes 224.7 Earth days for Venus to revolve completely around the sun. So compared to planet Earth, Venus's sister planet, it takes Venus much, much longer to get through a day, but it takes much less time than Earth for Venus to experience a whole year. And after 243 of our days, guess where the Venus sun sets? In the east! On Venus, the sun rises in the west and sets in the east.

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