The second definition, based on the Sun's position in the sky, is called a "solar day". This is actually longer than a year on Venus (224.7 Earth days). Mercury - about 59 days; Venus - 243 days; Earth - 1 day; Mars - about 1 day, 0.6 hours; Jupiter - 9 hours; Saturn - about 10 hours; Uranus - about 13 hours; Neptune - about 15 hours; Increasing day length on Earth. It spins only once every 243 Earth days. Venus also rotates in the opposite direction to the other planets in the Solar System. Length of the day on other planets. It rotates in the direction of Earth and the other planets in the Solar System (Uranus spins on its side). This uses Earth time. One day on Venus is about 243 Earth days long. So, if we put simple logic, on Venus, a decade would be 225 x 10 = 2250 days. On average, a mean solar day in the last 365 days was 0.02 ms over 24 hours, so today's day length is above average. 243 Earth days Just as Earth moves around the sun, the moon revolves around Earth. The rotation of Venus on its axis is retrograde. How long is a year on this planet? A. Mars B. Mercury C. Neptune D. Uranus E. Venus correct answer: B 3. He recorded information about the orbit and the rotation of each planet in the table below.How long is a day on Venus? The planet Venus has the slowest rotation of any major planet in our solar sytsem. If every day was as long as today, a leap second would have to be added every 1998.80 days. So, one Venus day is longer than one Venus year. It takes Venus 243 days to do this. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. Kevin Gill/Flickr/CC BY 2.0. That's the equivalent of 243 Earth days. In Venus 1 day is equivalent to 243 earth days and 1 year is equivalent to 225 earth days. The definition of a day is how long it takes for a planet to do one complete rotation on its own axis. 24 Earth days C. 93 Earth days D. 124 Earth days E. 176 Earth days Correct answer: E (176 Earth days) 2. A. Which planet has virtually no atmosphere? Mercury has a _____ core. One day on Venus is 243 Earth days long. 1. Because it's closer to the Sun than Earth is, the planet has a 225-day year. Why is a day on Venus longer than a year? Over this period, 82 days have been longer than today, while 284 have been shorter than today. On Earth these two measurements are almost the same but on Venus they are very different. About how long is a solar day on Mercury? Why does Venus rotate backward? On Venus this is 243.025 Earth days. , a day on Venus is longer than a year on Venus. It also takes Venus 225 Earth days to orbit the Sun, so one day on Venus (one rotation around it's axis) is actually longer than one trip around the Sun (a Venus year.) One year on Venus is almost 225 Earth days long. Venus rotates around itself so slow that it complete onw orbit around the sun before that. 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