# Do the planets orbit the sun on a 2-D plane?

Mar 7, 2016

No, the planets do not orbit the Sun in a 2D plane.

#### Explanation:

Each planet orbits the sun in a slightly different plane. This is called inclination. The orbit of the Earth, the plane of the ecliptic, is defined to be the 0&deg; plane. Hence, by definition, the inclination of the Earth's orbit is 0&deg;.

The orbital inclination of the planets relative to the ecliptic are:
Mercury ${7.01}^{\circ}$;
Venus ${3.39}^{\circ}$;
Earth ${0}^{\circ}$;
Mars ${1.85}^{\circ}$;
Jupiter ${1.31}^{\circ}$;
Saturn ${2.49}^{\circ}$;
Uranus ${0.77}^{\circ}$;
Neptune ${1.77}^{\circ}$;