How does it take for Venus to rotate on it's axis?

Answer 1

Venus orbits the Sun at an average distance of about 108 million kilometers (about 0.7 AU), and completes an orbit every 224.65 days. Although all planetary orbits are elliptical, Venus is the closest to circular, with an eccentricity of less than 0.01. When Venus lies between the Earth and the Sun, a position known as "inferior conjunction", it makes the closest approach to Earth of any planet, lying at an average distance of 41 million km during inferior conjunction. The planet reaches inferior conjunction every 584 days, on average. Due to the decreasing eccentricity of Earth, the minimum distances will become greater. From the year 1 to 5383, there are 526 approaches less than 40 million km; then there are none for about 60,200 years. During periods of greater eccentricity Venus can come as close as 38.2 million km.

If viewed from above the Sun's north pole, all the planets are orbiting in a counterclockwise direction; but while most planets also rotate counter-clockwise, Venus rotates clockwise in "retrograde" rotation. The present rotation period of Venus represents an equilibrium state between gravitational tidal locking by the Sun that tends to slow the rotation rate, and an atmospheric tide created by the solar heating of the thick Venusian atmosphere. When it formed from the solar nebula, Venus may have begun with a different rotation period and obliquity, then migrated to the current state because of chaotic spin changes caused by planetary perturbations and tidal effects on its dense atmosphere. This change in the rotation period probably took place over the course of billions of years.

Venus rotates once every 243 Earth days---by far the slowest rotation period of any of the major planets. At the equator, the Venusian surface rotates at 6.5 km/h; on Earth, the rotation speed at the equator is about 1,670 km/h. A Venusian sidereal day thus lasts longer than a Venusian year (243 versus 224.7 Earth days). However, because of the retrograde rotation, the length of a solar day on Venus is significantly shorter than the sidereal day. To an observer on the surface of Venus the time from one sunrise to the next would be 116.75 Earth days (making the Venusian solar day shorter than Mercury's 176 Earth days). Additionally, the Sun would appear to rise in the west and set in the east. As a result of Venus's relatively long solar day, one Venus year is about 1.92 Venus days long.

A curious aspect of the Venusian orbit and rotation periods is that the 584-day average interval between successive close approaches to the Earth is almost exactly equal to five Venusian solar days. Whether this relationship arose by chance or is the result of tidal locking with the Earth, is unknown.

Venus currently has no natural satellite, though the asteroid 2002 VE68 presently maintains a quasi-orbital relationship with it. In the 17th century,Giovanni Cassini reported to have seen a moon orbiting Venus, which was named Neith, after the Egyptian goddess. Over the following 200 years there were numerous reported sightings. Ultimately, it was determined that most of them could be explained by stars which had been in the vicinity of Venus. According to Alex Alemi and David Stevenson of the California Institute of Technology, their 2006 study of models of the early Solar System shows that it is very likely that, billions of years ago, Venus had at least one moon, created by a huge impact event. About 10 million years later, according to the study, another impact reversed the planet's spin direction. This caused the Venusian moon gradually to spiral inward until it collided and merged with Venus. If later impacts created moons, those also were absorbed in the same manner. An alternative explanation for the lack of satellites is the effect of strong solar tides, which can destabilize large satellites orbiting the inner terrestrial planets.

Answer 2

Venus is unusual in that it rotates on its axis upside down - or spins the opposite direction than that in which it orbits the sun. If you could see the Sun from the surface of Venus, it would appear to rise in the west and set in the east. It is also unusual in that its orbital period or year (about 225 Earth days) is shorter than its rotational period (about 243 days) - but since it orbits upside-down (retrograde) an observer on Venus would experience almost two days during its year.

Answer 3

yes, but very slowly compared to most other planets.

Answer 4

It takes Venus 243 days to rotate on its axis. Since it takes Venus 225 days to orbit the Sun, Venus' year is shorter than its day.

Answer 5

The rotation of venus is clockwise on its axis, when seen from north pole of sun.

Answer 6

I think the exact number is 257 earth days. Venus has a very slow retrograde rotation, so the number is written usually thus; - 257 earth days.