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Which planet has the longest day?
So, Venus has the longest day of any planet in our solar system. It completes one rotation every 243 Earth days. Its day lasts longer than its orbit.
It orbits the Sun every 224.65 Earth days, so a day is nearly 20 Earth days longer than its year.
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Orbit and rotation
Venus rotation and orbit are unusual in several ways, Venus is one of just two planets that rotate from east to west.
Only Venus and Uranus have this "backwards" rotation. It completes one rotation in 243 Earth days — the longest day of any planet in our solar system, even longer than a wh...
Orbit an rotation
As mars orbits the Sun, it completes one rotation every 24,6 hours, which is very similar to one day on Earth (23.9 hours). Martian days are called sols—short for "solar day." A year on Mars lasts 669.6 sols, which is the same as 687 Earth days.
Mars' axis of rotation is tilted 25 degrees w...
Orbit and rotation
Mercury's highly eccentric, egg-shaped orbit takes the planet as close as 29 million miles (47 million kilometers) and as far as 43 million miles (70 million kilometers) from the Sun. It speeds around the Sun every 88 days, traveling through space at nearly 29 miles (47 kilometers) per second, fa...
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