As I know on Low Earth Orbit it takes around 90 minutes to orbit the Earth, but this changes with altitude. Hi, I need help with this problem of physics about circular motion: Calculate how long it would take a ball to orbit the earth once , just above the surface , at a speed of 7920 ms^-1 . Neptune – 164 years, 8 months Well, 365 days is about how long it takes for Earth to orbit all the way around the Sun one time. 2977 Earth months (248 Earth years) The distance from the Sun is average because the orbits of the planets do not make perfect circles, but rather very slightly flattened ones, or ellipses. With all systems running smoothly during his initial orbit, Control advised him that he “had a go” for at least seven turns around the earth. The radius of earth … Earth – 1 year. Mars – 1 year, 9 months. Credit: NASA/Terry Virts. The Earth completes one orbit every 365.242199 mean solar days, a fact which goes a long way towards explaining why need an extra calendar day every four years (aka. On earth, it's not so easy because satellites have to get up above the atmosphere and into the vacuum of space to orbit for any length of time. But the principle is exactly the same. Minutes later, Glenn was 100 miles above the earth and traveling at more than 17,000 miles per hour. 200 miles (320 km) up is about the minimum to avoid atmospheric interference. Low-Earth Orbit. One orbit of the Earth takes one year. Venus – 224 days. Earth orbits around the Sun in approximately 365 days. An orbit is the path one object in space takes around another. Meanwhile, our entire solar system – our sun with its family of planets, moon, asteroid and comets – orbits the center of the Milky Way galaxy. It’s not exactly this simple though. However, he got into space but he did not do a full orbit of the Earth, like Gagarin had. A low Earth orbit (LEO) is an Earth-centred orbit with an altitude of 2,000 km (1,200 mi) or less (approximately one-third of the radius of Earth), or with at least 11.25 periods per day (an orbital period of 128 minutes or less) and an eccentricity less than 0.25. John Glenn was the first US citizen to go into space, a short time after Yuri Gagarin in 1961. Saturn – 29 years, 6 months. What causes an orbit … Jupiter – 11 years, 9 months. Most of the artificial objects in outer space are in LEO.. Here is (approximately) how long it takes each planet to orbit the sun: Mercury – 88 days. during a leap year). Often abbreviated as LEO, it’s an orbit around Earth at an altitude of 160 km to 2,000 km (99 – 1200 miles). In this orbit, the orbital period is 88 minutes, which means that an object can complete one revolution around the planet in less than an hour and a half! The Hubble space telescope orbits at an altitude of 380 miles (600 km) or so. A year is measured by how long it takes a planet to orbit around its star. Uranus – 84 years.