A single year on the planet Mercury lasts about half as long as its day. Venus is one of just two planets that rotate from east to west. The planet’s orbit around the Sun takes 225 Earth days, compared to the Earth’s 365. It has a day longer than a year. A day on Venus lasts longer than a year. Researchers have spent decades trying to pin down exactly how long a day on Venus lasts. It is a terrestrial planet because it has a solid, rocky surface like other planets in the inner solar system. 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. A day on the surface of Venus (solar day) takes 117 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 The day length of Venus is 243 Earth days. Venus is the second closest planet to our Sun at an average distance 67 million miles. Venus is the second planet from the sun. It revolves around the Sun every 225 Earth days, but its rotation takes 243 Earth days. 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. 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 Finding the answer cuts to the core of fundamental mysteries about the planet. 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. These observations showed the length of a Venusian day is 243 days, or 5,832 hours. 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. Venus' rotation and orbit are unusual in several ways. The year length of Venus is 225 Earth days. Kevin Gill/Flickr/CC BY 2.0. Only Venus and Uranus have this "backwards" rotation. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. It takes 243 Earth days to rotate once on its axis (sidereal day). Because it's closer to the Sun than Earth is, the planet has a 225-day year. Subsequent measurements have, however, given inconsistent values, differing by about six minutes. Astronomers have known Venus for … Venus rotates in the opposite direction to most other planets. Earth's length of day = 24 hours 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 spins very slowly, taking about 243 Earth days to complete one rotation with respect to the stars—the length of its sidereal day. Venus 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. 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