So, the day is actually longer than a year, which means that Venus residents would only get to see two sunrises per year. If every day was as long as today, a leap second would have to be added every 1998.80 days. He recorded information about the orbit and the rotation of each planet in the table below.How long is a day on Venus? That's the equivalent of 243 Earth days. A. The planet Venus has the slowest rotation of any major planet in our solar sytsem. How long is a year on this planet? The definition of a day is how long it takes for a planet to do one complete rotation on its own axis. Kevin Gill/Flickr/CC BY 2.0. In Venus 1 day is equivalent to 243 earth days and 1 year is equivalent to 225 earth days. 24 Earth days C. 93 Earth days D. 124 Earth days E. 176 Earth days Correct answer: E (176 Earth days) 2. Mercury has a _____ core. On Venus this is 243.025 Earth days. One year on Venus is almost 225 Earth days long. So, one Venus day is longer than one Venus year. One day on Venus is 243 Earth days long. 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. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. The rotation of Venus on its axis is retrograde. 0.5 Earth days B. The second definition, based on the Sun's position in the sky, is called a "solar day". Over this period, 82 days have been longer than today, while 284 have been shorter than today. Length of the day on other planets. Because it's closer to the Sun than Earth is, the planet has a 225-day year. About how long is a solar day on Mercury? 1. It takes Venus 243 days to do this. A. Mars B. Mercury C. Neptune D. Uranus E. Venus correct answer: B 3. Why does Venus rotate backward? Which planet has virtually no atmosphere? , a day on Venus is longer than a year on Venus. The first definition, the rotation period, is called a "sidereal day". 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.) This uses Earth time. Venus rotates around itself so slow that it complete onw orbit around the sun before that. 243 Earth days Just as Earth moves around the sun, the moon revolves around Earth. On Earth these two measurements are almost the same but on Venus they are very different. Venus also rotates in the opposite direction to the other planets in the Solar System. 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. This is actually longer than a year on Venus (224.7 Earth days). Why is a day on Venus longer than a year? It rotates in the direction of Earth and the other planets in the Solar System (Uranus spins on its side). 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