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Venus or Mercury, depending on the definition of "day" used. It takes Venus 243 Earth days to spin on its axis relative to the background stars (a "sidereal day"). It takes Venus 224.7 Earth days to orbit the Sun (its year). However, a "solar day" is only 116.75 Earth days long due to the combination of rotation time, orbit time and spin direction. (Venus spins in the other direction to Earth and most other planets.)

Mercury has a "sidereal day" of about 58.6 Earth days and a year of about 88 Earth days.

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12y ago

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