Jupiter is the planet that spins the fastest, completing one rotation in just under about 10 Earth hours, giving it the shortest day in the Solar System.

Fastest spinning planet

Jupiter is the largest planet in the Solar System, yet it also has the quickest rotation period, turning once on its axis in roughly 9.9–10 hours. This rapid spin means points near its equator move at around 28,000 miles per hour (about 43,000 kilometers per hour).

How Jupiter compares to other planets

The gas giants generally spin faster than the rocky planets, but Jupiter is still the champion among them. Saturn, the second fastest, has a day a bit over 10.5 hours long, while Earth takes 24 hours and Venus is so slow that one rotation takes about 243 Earth days.

Planet spin speeds

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Planet Approx. length of day Notes
Jupiter ~9.9–10 hours Fastest spin; equator speed ≈ 28,000 mph.
Saturn ~10.5 hours Second fastest spinner.
Earth 24 hours Fastest of the rocky planets.
Venus ~243 Earth days Slowest spin; rotates extremely slowly.

Why it matters

Because Jupiter spins so quickly, its shape is noticeably flattened at the poles and bulged at the equator. The rapid rotation also helps drive powerful atmospheric bands and storms, including the famous Great Red Spot.

Information gathered from public forums or data available on the internet and portrayed here.