Pluto has the longest REVOLUTION period
Venus has the longest ROTATION period
Uranus has the longest day of any planet in the solar system, with a rotation period of about 17 hours and 14 minutes.
The planet with the largest (or longest) rotation period is Venus, at 243 Earth days (retrograde, meaning clockwise, instead of counterclockwise like the Earth).
Venus
venus
There is no such planet known. The planet with the longest rotation period is Venus. That rotates in about 243 Earth days.
Venus
chocolate pie... but that was 3 years ago...
If you count Pluto as a planet its Pluto :D
If you mean revolution on it axis (spin/day length) rather than orbital period, then the answer is the planet Mercury, where time between sunrises is roughly 176 Earth days.
Mercury has the 2nd longest "sidereal day" with a sidereal rotation period of 58.646 Earth days. The longest "sidereal day" day is Venus, with a sidereal rotation period of 243.018 Earth daysIf you use the "solar day" as your definition of "day", the order is reversed. Mercury then has the longest day and Venus has the second longest day.
''Mercury (shortest),''Neptune (longest)
The difference between the rotation and revoulution is that rotation is the spiinning of the planet on its axis and revoulution is the orbiting of the planet around the sun.