SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-jupiter-shortest-day

Which planet has the shortest day?

Jupiter, rotating once in about 9.9 hours.

Start playing free

  1. Earth
  2. Mars
  3. Jupiter ✔

Why: Jupiter spins faster than every other planet. One rotation takes only about 9.9 hours, so its day is less than half an Earth day.

Huh, didn't know that: Jupiter's rapid spin helps drive powerful bands of eastward and westward winds.

The dad joke
Jupiter's day ends before it finishes saying good morning.
Like this card?
Play the game

References

Answer: Jupiter. Jupiter spins faster than every other planet. One rotation takes only about 9.9 hours, so its day is less than half an Earth day.

  1. Jupiter Facts science.nasa.gov/jupiter/jupiter-facts
    Jupiter has the shortest day in the solar system.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Flying & DronesOn which planet would the Sun rise in the west?Flying & DronesWhich planet appears to spin on its side?Flying & DronesEarth spinning on its axis once each day causes what?

That's stuff everyone should know.