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{{wiktionary|eccentric|eccentricity}}
In ], eccentricity is a measure of how much an ellipse deviates from a circle.


'''Eccentricity''' or '''eccentric''' may refer to:
To calculate the eccentricity of any ellipse, measure the semi-major axis
and call it <i>a</i>. Measure the semi-minor axis and call that measurement
<i>b</i>. Now:


* ], odd behavior on the part of a person, as opposed to being "normal"
:eccentricity = <i>e</i> = square root( (<i>a</i><sup>2</sup> - <i>b</i><sup>2</sup>)/<i>a</i><sup>2</sup>)
{{toc_right}}


==Mathematics, science and technology==
The eccentricity of an ] is greater than zero and smaller than 1
===Mathematics===
* Off-], in geometry
* ] of a vertex in a graph
* ], a parameter associated with every conic section


===Orbital mechanics===
The eccentricity of a ] is zero.
* ], in astrodynamics, a measure of the non-circularity of an orbit
* ], the angle between the direction of periapsis and the current position of an object on its orbit
* ], in celestial mechanics, a dimensionless vector with direction pointing from apoapsis to periapsis
* Eccentric, a type of ], a circle or sphere used in obsolete epicyclical systems to carry a planet around the Earth or Sun


===Other uses in science and technology===
The eccentricity of a ] is 1.
* ], a wheel that rotates on an axle that is displaced from the focus of the circle described by the wheel
* ], in vision, degrees of visual angle from the center of the eye
* ], the lengthening of muscle fibers
* Eccentric position of a ] tripod, to be able to measure hidden points
* ], the motion of an active muscle while it is lengthening under load
* Eccentricity, a deviation from ]


==Other uses==
The eccentricity of a ] is greater than 1.
* ], a London gentlemen's club
* '']''
* '']''


== See also ==
In ], eccentricity refers to the deviation of an object's orbital motion from a circular orbit, according to the mathematical formula given above.
* {{lookfrom|eccentric}}
* {{intitle|eccentric*}}
* ]


{{disambiguation}}
In popular usage, eccentricity refers to unusual or odd behavior on the part of a person.
]

Latest revision as of 01:13, 29 June 2021

Eccentricity or eccentric may refer to:

Mathematics, science and technology

Mathematics

Orbital mechanics

  • Orbital eccentricity, in astrodynamics, a measure of the non-circularity of an orbit
  • Eccentric anomaly, the angle between the direction of periapsis and the current position of an object on its orbit
  • Eccentricity vector, in celestial mechanics, a dimensionless vector with direction pointing from apoapsis to periapsis
  • Eccentric, a type of deferent, a circle or sphere used in obsolete epicyclical systems to carry a planet around the Earth or Sun

Other uses in science and technology

Other uses

See also

Topics referred to by the same term Disambiguation iconThis disambiguation page lists articles associated with the title Eccentricity.
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