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Like all planets in our solar system, the Earth is in an elliptical orbit around our Sun. In Earth's case, its orbit is nearly circular, so that the difference between Earth's farthest point from the Sun and its closest point is very small. Earth's orbit defines a two-dimensional plane which we call the ecliptic.The Earth with its Sun.he Earth's orbit is in the shape of an ellipse, so that sometimes the Earth is a little bit closer to the Sun than at other times.
This apparent erratic movement is called retrograde motion.. The illusion also happens with Jupiter and the other planets that orbit farther from the sun. Just to make things a little more odd, the orbits that Earth and Mars follow don't quite lie in the same plane.It's as if the two planets were on separate tracks that are a little tilted with respect to each other.ust to make things a little more odd, the orbits that Earth and Mars follow don't quite lie in the same plane. It's as if the two planets were on separate tracks that are a little tilted with respect to each other.