It is Venus because according to the earth science reference tables, its eccentricity is closest to zero. The more closer to zero, the closer to a perfect circle it is.
I hope i answer your question. I'm an 8th grader who was also looking for the answer, but i found it somewhere else. I usually use WikiAnswers too. So I felt like being helpful so here is your answer(: From an 8th grader in New York.
The earth's orbit is almost a circle, but not quite. It is elliptical, but the difference between the closest and farthest points is less than 4%. This is such a small difference that it would look like a circle to most people. Astronomy books often show misleadingly exagerated elliptical orbits.
Kepler discovered that the orbit of each planet is an ellipse rather than a perfect circle. The planet with an orbit that is closest to a circle is Venus.
The planets orbit the sun in an ellipse, like a squashed circle. The amount by which the ellipse is deformed by, from being a circle, is referred to as the eccentricity. An object with a highly eccentric orbit, such as a comet, will have a very elongated and stretched out orbit, its distance from the sun throughout its orbit will vary by a lot.
Mars and Venus orbit closest to the earth in the order sunward to rimward: Venus, Earth, Mars.
The orbit of Jupiter is closer to Mars' orbit than to Saturn's orbit. Mars = 1.52AU Jupiter = 5.20AU Saturn = 9.54AU Having said that, the positions of the planets are always changing as the planets orbit the sun at different rates. Mars is the closest planet to Jupiter as of February 2011, but this is not always the case.
Jupiters orbit is a imaginary circle that the planets circle around that is how we count years.
perihelion is the point in a planets orbit when it is closest to the sun
Planets circle in an elliptical orbit around the Sun.
Closest to the sun
Jupiters orbit is a imaginary circle that the planets circle around that is how we count years.
The gravitational pull.
The Inner Planets: Mercury, Venus, Earth and Mars
If you mean the trajectory of the planets around their parent stars, it is called the orbit, and it is not a circle but an ellipse
Kelper determined that the orbit of Mars orbit is not a circle but an ellipse.
Mercury has the shortest orbit of all the planets because it is the closest planet to the Sun.
All planets circle the CEntral Star. So in a way outer planets almost circle inner planets but the Star is at one focus of the planets' orbits so it is more proper to say that planets orbit stars.
The earth's orbit is almost a circle, but not quite. It is elliptical, but the difference between the closest and farthest points is less than 4%. This is such a small difference that it would look like a circle to most people. Astronomy books often show misleadingly exagerated elliptical orbits.