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eccentricity

eccentricity

2 9.1
A measure of how much a curve or orbit differs from a perfect circle
  • noun
  • /ˌɛksɛnˈtrɪsɪti/
  • Specialized
translation icon : excentricidad
  • The major ice age climate cycles are controlled by the sun, Earth orbital eccentricity, and the Earth's obliquity and precession.
  • orbital eccentricity
  • eccentricity of their orbits
  • initial eccentricity

Examples

  • But we're on course to take advantage of the orbital eccentricity and meet it at its perihelion.

  • So whenever the eccentricity is less than one, we have an ellipse.

  • None of the gas giants in our solar system has an eccentricity of more than 0.06.

    Academic text (1999)
  • Its orbit was close to Earth's with no inclination to speak of and just a little eccentricity.

    Fiction book (2001)
  • In our solar system, Pluto has the largest eccentricity at 0.25, with Mercury a close second at 0.21.

    Academic text (1999)
  • The eccentricity of the Earth's orbit causes variation in its distance from the Sun during the year.

  • In mathematics, the eccentricity of an ellipse is always less than one.

  • The scientist explained that the eccentricity of a comet's orbit can lead to long periods of invisibility.

Synonyms

ellipticity
vseccentricity
  • Specialized
9.0

How flattened a round object like a planet or galaxy is

measures how much a curve or orbit differs from a perfect circle
ovality
vseccentricity
7.7

How much a round shape is longer in one direction than the other

measures deviation from a perfect circle for curves and orbits

How Eccentric

eccentricity
  • Specialized
2 9.1
ellipticity
  • Specialized
9.0
circularity
1 6.1

Surface Forms

eccentricity singular

Morphology

eccentricity = eccentric (semi-transparent) = eccentric + ity

Formed from 'eccentric' + '-ity', but the mathematical sense refers to a specific numeric measure which is a technical extension not obvious to all learners.

Etymology

Eccentricity comes from parts that mean 'out' and 'center' — the prefix ec- means 'out' and centric is like center. So in math and physics, eccentricity is a number that shows how far a curve or an orbit is 'off the center', which is why a low eccentricity means almost a perfect circle.