What is the exact circumference of the orbit of earth around sun?

Question

if it is different for each yerr i want to attain the number for 2001

Answer 1

You can't get an exact circumference fo the Earth's orbit because it is elliptical.

You can get a very close approximation. This website lists different formulas and their history: http://home.att.net/~numericana/answer/ellipse.htm

a would be your semi-major axis and b your semi-minor axis. The semi-major axis of the Earth's orbit is 149,597,887.5 KM and the semi-minor axis is equal to a*sqrt(1-e^2), or about 149,576,999.826 km. The eccentricity of the Earth's orbit is 0.016 710 219.

Answer 2

Like some of the other guys said, the orbit is close to an ellipse. And, it changes all the time, so that the Earth doesn't come back to the exact same place after a year. This is because of the gravity effect of the Moon, Mars, Venus, Jupiter, and the other planets.

Still, we can talk about the "average" orbit. This has an semi-major axis of 1.00000261 AU, with an eccentricity of 0.01671123.

1 AU = 149,597,870.691 kilometers

These numbers are for the year 2000. the semi-major axis is increasing at about 0.00000562 AU per century, and the eccentricity is decreasing by about 0.00004392 per century.

Answer 3

The orbit of Earth arount the Sun is not a circunference, but an ellipse. For their parameters, see

http://www.physicalgeography.net/fundamentals/6h.html

Answer 4

The radius would be 93000000 miles, so to get the circumference, you mutiply by 2pi, giving about 584040000 miles. (This is an approximation as the prbit of the earth is mildly ellipsoidal, but its close).

Answer 5

NASA says 924,375,700 km

;-D I had to look it up. There are several mathematical formulae but I didn't want to do the math! hahahaha!

Answer 6

It is the same every year.