None of the planets orbit the sun perfectly in a circle, there is a degree of deviation from this perfect circle called eccentricity. The higher the eccentricity (more more the eccentric the orbit is) the further away from this perfect circle the orbit is.
The planet that deviates most from a perfect circle, having the highest eccentricity, is Neptune. Neptune also has the highest axial tilt, tilted over onto its side as it orbits the sun.
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Our day is based on the Earth's rotation, that is most people say it is 24 hours. If you want to get technical it takes 23 hours, 56 minutes, and 4.2 seconds.
no, comets do not orbit Earth. If comets did orbit Earth, it would be Earths Moon's, but comets orbit the kuiper belt at the edge of the Solar System. Some times comets hit each other and get knocked out of their orbit and possibly hit a planet.
23.5º23.5 Degrees is most believed but it changes from 21 to 25.
pluto... :)
'Counter-clockwise' requires a reference point such that we can determine which side of the galactic plane one is on to look at the direction of spin. That said, the planets do all orbit in the same direction. Additionally, Venus, Uranus and the Plutoid all spin in different directions than the other planets, which spin the same way as their orbits. Venus spins in the exact opposite direction (retrograde), Uranus has its axis of spin on the galactic plane, and the Plutoid's axis is inclined 123 degrees to its plane of orbit, making its spin retrograde as well.