# Resolve RDF Terms

quantitykind:EccentricityOfOrbit
http://qudt.org/vocab/quantitykind/EccentricityOfOrbit

### Recommended prefix

quantitykind:

lang:en
Eccentricity Of Orbit
lang:""
$$\varepsilon$$
lang:""
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle. In a two-body problem with inverse-square-law force, every orbit is a Kepler orbit. The eccentricity of this Kepler orbit is a positive number that defines its shape.