mercury has the most eccentric orbit of all the planets in the solar system. it has an eccentricity of 0.21. it ranges from 46,000,000 to 70,000,000 km (29,000,000 to 43,000,000 mi) away from the sun. mercury takes 87.969 earth days to go around the sun. mercury's axial tilt is 0.027 degrees.