parameter that determines the amount by which an astronomical object's orbit around another body deviates from a perfect circle
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See also: • 'Eccentricity of an Orbit'. Windows to the Universe, 16 December 2005, https://www.windows2universe.org/physical_science/physics/mechanics/orbit/eccentricity.html [15.6.2017] • Jean Tate, 'Eccentricity', Universe Today, 6 April 2016, https://www.universetoday.com/57964/eccentricity/ [15.6.2017]
