Researchers have spent decades trying to pin down exactly how long a day on Venus lasts. The day length of Venus is 243 Earth days. Venus spins very slowly, taking about 243 Earth days to complete one rotation with respect to the stars—the length of its sidereal day. 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. Only Venus and Uranus have this "backwards" rotation. A day on the surface of Venus (solar day) takes 117 Earth days. It takes 243 Earth days to rotate once on its axis (sidereal day). Subsequent measurements have, however, given inconsistent values, differing by about six minutes. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. Finding the answer cuts to the core of fundamental mysteries about the planet. Venus is the second planet from the sun. It is a terrestrial planet because it has a solid, rocky surface like other planets in the inner solar system. 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. Venus' rotation and orbit are unusual in several ways. These observations showed the length of a Venusian day is 243 days, or 5,832 hours. Kevin Gill/Flickr/CC BY 2.0. Venus is one of just two planets that rotate from east to west. Astronomers have known Venus for … 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 closest planet to our Sun at an average distance 67 million miles. Earth's length of day = 24 hours 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. The year length of Venus is 225 Earth days. Because it's closer to the Sun than Earth is, the planet has a 225-day year. Venus rotates in the opposite direction to most other planets. 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. 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. 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. It has a day longer than a year. 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