0.007
Of the planets in our solar system, Venus has the smallest eccentricity.
Venus' orbital path is the most circular of all the planets. The eccentricity of the orbit of Venus is less than 0.01.
Venus has an eccentricity of 0.00677323 Neptune has an eccentricity of 0.00858587 Triton, a moon of Neptune, orbit is as close to a perfect circle with an eccentricity of 0.000016 The Earth for comparison has an eccentricity of 0.01671022
Venus has the most nearly circular orbit of all the planets in our solar system. Its eccentricity, a measure of how elongated an orbit is, is only 0.0067, making it almost circular compared to other planets like Mercury or Mars.
The Earths orbit is fairly un-eccentric when compared to the other planets, with only Neptune and Venus having more regular (less eccentric) orbits. The eccentricity of earths orbit is 0.0167, the closest to this is Neptune's, with a value of 0.00859
Earth has an average eccentricity in its orbit of 0.0167. This compares with 0.0068 for Venus and 0.205 for Mercury, which are the minimum and maximum eccentricities in the eight planets. So, the Earth's orbit is not too far from circular. In order of increasing eccentricity, the list of planets is: Venus Neptune Earth Uranus Jupiter Saturn Mars Mercury.
There is no strict pattern. Mercury, the innermost planet, has the highest eccentricity. Venus, the next nearest to the sun, and Neptune, the outermost have the least eccentricities.
Planets don't have circular orbits; all orbits are ellipses. A circle has one center, but an ellipse has two focuses, or "foci". The further apart the foci, the greater the eccentricity, which is a measure of how far off circular the ellipse is. Venus has the lowest eccentricity, at 0.007. Neptune is next with an eccentricity of 0.011. (Earth's orbit has an eccentricity of 0.017.) So, Venus has the shortest focus-to-focus distance.
All the planets have elliptical orbits, but Mercury and Mars have the greatest eccentricity. As to why Mercury's orbit is the most eccentric may be related to its proximity to the Sun.
Venus has the most nearly circular orbit of all the planets in our solar system. Its orbit has the least eccentricity, meaning it is closest to being a perfect circle.
Very little because Venus's orbit has a low eccentricity of 0.0067, which means that its distance from the Sun varies by only 0.7% above and below its average.
Venus takes about 225 Earth days to complete one orbit around the sun. Its orbit is almost circular, with very little eccentricity compared to other planets.