Planet Day Length Comparison (Rotation Hours)
How long is a Venus day at 5832.5 hours? Compare all 8 planet rotation periods from Jupiter to Mercury with NASA rotation data in a linked converter tool.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| Venus day Top here at 5832.5 hours. Spins backwards. | 5,832.5 hours | NASA fact sheet, slowest | NASA planetary fact sheet: Venus rotation 5832.5 hours |
| Mercury day 1407.6 hours. Solar day differs. | 1,407.6 hours | NASA fact sheet, second slowest | NASA planetary fact sheet: Mercury rotation 1407.6 hours |
| Uranus day 17.2 hours. Spins backwards. | 17.2 hours | NASA fact sheet, ice giant | NASA planetary fact sheet: Uranus rotation 17.2 hours |
| Neptune day 16.1 hours. Windy giant. | 16.1 hours | NASA fact sheet, outermost | NASA planetary fact sheet: Neptune rotation 16.1 hours |
| Saturn day 10.7 hours. Ringed spinner. | 10.7 hours | NASA fact sheet, gas giant | NASA planetary fact sheet: Saturn rotation 10.7 hours |
| Jupiter day Shortest here at 9.9 hours. | 9.9 hours | NASA fact sheet, largest | NASA planetary fact sheet: Jupiter rotation 9.9 hours |
| Earth day 23.9 hours. Standard line. | 23.9 hours | NASA fact sheet, home | NASA planetary fact sheet: Earth rotation 23.9 hours |
| Mars day 24.6 hours. Close to Earth. | 24.6 hours | NASA fact sheet, red planet | NASA planetary fact sheet: Mars rotation 24.6 hours |
About this converter
Planet rotation periods run 9.9 to 5832.5 hours across all eight planets. Venus at 5832.5 hours tops the table with a day longer than its year. Mercury at 1407.6 hours follows as the slow spinner pair. Earth at 23.9 and Mars at 24.6 anchor the familiar day. Uranus at 17.2 and Neptune at 16.1 sit mid fast. Saturn at 10.7 and Jupiter at 9.9 close as the fastest. Every value is the NASA planetary fact sheet sidereal rotation period in hours.
How to use it
Pick two planets and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. One box holds a count of the first day, one holds the matching count of the second, one holds total hours. Try 1 Venus day against Earth days.
Solar days differ from rotation periods on Mercury and Venus, so rows pin rotation periods to keep one scale, stated here. Venus and Uranus spin backwards and notes carry that fact. Pluto stays out as a dwarf planet. One Venus day equals over 243 Earth days of hours. Earth at 23.9 anchors the scale between Mercury and the fast giants.
FAQ
Which planet day is longest?
Venus at 5832.5 hours, longer than its year. It spins backwards.
Which is shortest?
Jupiter at 9.9 hours.
Where are these numbers from?
NASA planetary fact sheets, sidereal rotation periods in hours.
Is Pluto included?
No. Only the eight planets are rowed. Pluto stays out.
Sources
- NASA planetary fact sheets (Venus 5832.5, Mercury 1407.6, Uranus 17.2, Neptune 16.1)
- NASA planetary fact sheets (Saturn 10.7, Jupiter 9.9, Earth 23.9, Mars 24.6)
Last verified: 2026-10-03 · 8 entries
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