It takes 243 Earth days to rotate once on its axis (sidereal day). The day length of Venus is 243 Earth days. A day on the surface of Venus (solar day) takes 117 Earth days. Venus rotates in the opposite direction to most other planets. In 1991, studies based on the Magellan spacecraft’s observations concluded that the correct rotation period is 243.0185 days, with an uncertainty of about 9 seconds. Length of Day: The average time for the Sun to move from the Noon position in the sky at a point on the equator back to the same position. Subsequent measurements have, however, given inconsistent values, differing by about six minutes. Venus spins very slowly, taking about 243 Earth days to complete one rotation with respect to the stars—the length of its sidereal day. The planet’s orbit around the Sun takes 225 Earth days, compared to the Earth’s 365. Venus' rotation and orbit are unusual in several ways. Kevin Gill/Flickr/CC BY 2.0. Researchers have spent decades trying to pin down exactly how long a day on Venus lasts. Venus is the second closest planet to our Sun at an average distance 67 million miles. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. Because it's closer to the Sun than Earth is, the planet has a 225-day year. A day on Venus lasts longer than a year. These observations showed the length of a Venusian day is 243 days, or 5,832 hours. Venus is the second planet from the sun. It has a day longer than a year. Astronomers have known Venus for … A single year on the planet Mercury lasts about half as long as its day. Rotation period (length of day in Earth days) 243.02 (retrograde) Revolution period (length of year in Earth days) 224.7 Obliquity (tilt of axis degrees) 178 Orbit inclination (degrees) 3.39 Orbit eccentricity (deviation from circular) 0.007 Mean surface temperature (K) 726 Venus is the second planet after Mercury that is closer to the sun and lies in a distance of about 67.24 million miles away from the sun. Venus' rotation has slowed in the 16 years between the Magellan spacecraft and Venus Express visits; each Venusian sidereal day has increased by 6.5 minutes in that time span. Earth's length of day = 24 hours It revolves around the Sun every 225 Earth days, but its rotation takes 243 Earth days. So, the day is actually longer than a year, which means that Venus residents would only get to see two sunrises per year. It completes one rotation in 243 Earth days — the longest day of any planet in our solar system, even longer than a whole year on Venus. Venus 243 Earth days. Finding the answer cuts to the core of fundamental mysteries about the planet. The year length of Venus is 225 Earth days. Venus Observational Parameters Discoverer: Unknown Discovery Date: Prehistoric Distance from Earth Minimum (10 6 km) 38.2 Maximum (10 6 km) 261.0 Apparent diameter from Earth Maximum (seconds of arc) 66.0 Minimum (seconds of arc) 9.7 Maximum visual magnitude -4.8 Mean values at inferior conjunction with Earth Distance from Earth (10 6 km) 41.44 Apparent diameter (seconds of arc) 60.2 Venus’s spin and orbital periods are very nearly synchronized with Earth’s orbit such that, when the two planets are at their closest, Venus presents almost the same face toward Earth. Venus is one of just two planets that rotate from east to west. Only Venus and Uranus have this "backwards" rotation. 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