How Long is a Day on Venus?

by Fraser Cain on May 14, 2008

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Venus takes 224.65 days to complete each orbit. This is a little less than a year on Earth. But instead of a similar rotational period to Earth’s 24 hours, Venus takes 243 days to rotate once.

In other words, a day on Venus is longer than a year. This is the longest day in the entire Solar System. Even stranger, Venus rotates backwards compared to the other planets in the Solar System.

If you could stand on the surface of Venus, the Sun would appear to rise in the West and then set in the East.

About 

Fraser Cain is the publisher of Universe Today. He's also the co-host of Astronomy Cast with Dr. Pamela Gay.

Dick June 10, 2008 at 10:45 PM

Correction:
Venus does NOT “orbit backwards”. It orbits the Sun in the same direction as all the other planets, dwarf planets, and asteroids.

justme June 27, 2008 at 4:24 PM

Correction:
it rotate backwards around its own axes but orbits the sun same direction as all other planets. (not sure though)

Daniel July 21, 2008 at 10:41 PM

justme is correct.

What is often forgotten when talking about how long a day is on Venus, is that because Venus rotates slowly in a retrograde fashion and orbits conventionally, it is actually ~117 days between sunrises.

connor October 8, 2008 at 6:18 AM

how long is the day!!!

Tori December 2, 2008 at 7:28 AM

I still do not understand how long the day is. If it rotates backwards but orbits right the how long is the day?

rajni and hanan January 23, 2009 at 5:06 AM

wow

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