How Many Earth Days Are Equal To The Universe's Longest Day?


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Jason Schwarzmann Profile
Venus's day is the equivalent to 243 Earth days (or 5,832 hours), making this the longest 'day' in the current known universe.

Venus has a 'retrograde' motion, which means it goes against the rotations of all the other major planets in the solar system. All of the other planets in the solar system rotate in an anti-clockwise fashion when viewed from the position of the Sun's north pole, except for Venus, which rotates in a clockwise manner. Because of this retrograde motion, observers on the surface of Venus would see the Sun rise in the west and set in the east, opposite to what we here on Earth observe.

Venus' slow rotation makes it the slowest rotation of any planet known to many as well. By comparison, Venus' equator rotates at a speed of around 6.5 km/h, whereas the Earth's equatorial rotation speed is 1,670 km/h, and because of this, Venus' day lasts longer than it's year by 18.3 Earth days (Venus' year takes only 224.7 Earth days for it to go about the Sun).

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