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November 26, 2015
Posted by **Sara ** on Monday, November 14, 2011 at 4:53pm.

- Astronomy -
**tchrwill**, Monday, November 14, 2011 at 6:09pmThe eccentricity of Mar's orbit is .0934.

The semi-major axis is 141,643,675 miles.

Therefore, the perihelion distance is

r(p) = 141,643,675(1-.0934) = 128,414,418.

and

r(a) = 141,643,675(1+.0934) = 154,871,931.

The mean radius of the earth's orbit is

r = 92,960,242 miles.