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{{wiktionary|eccentric|eccentricity}}
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'''Eccentricity''' or '''eccentric''' may refer to:
In ], '''eccentricity''' is a parameter associated with every ]. It can be thought of as a measure of how much the conic section deviates from being circular. In particular:
* The eccentricity of a ] is zero.
* The eccentricity of an ] is greater than zero and less than 1
* The eccentricity of a ] is 1.
* The eccentricity of a ] is greater than 1.
* The eccentricity of a ] is ].


* ], odd behavior on the part of a person, as opposed to being "normal"
For any ellipse, where the length of the ] is ''a'', and where the same of the ] is ''b'':
{{toc_right}}


==Mathematics, science and technology==
:<math>\mbox{eccentricity} = e = \sqrt{1-\frac{b^2}{a^2}}</math>
===Mathematics===
* Off-], in geometry
* ] of a vertex in a graph
* ], a parameter associated with every conic section


===Orbital mechanics===
In ], the eccentricity of an ] can be calculated using this formula. For example, the eccentricity of the ]'s orbit is 0.0167.
* ], 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===
----
* ], a wheel that rotates on an axle that is displaced from the focus of the circle described by the wheel
In popular usage, '''eccentricity''' refers to unusual or odd ] on the part of a person, as opposed to being ]. Eccentric behavior is often considered whimsical or quirky, although it can also be strange and disturbing. American millionaire ], for example was considered to be very eccentric, and stored his ] in glass jars and never cut his hair or nails. Other people may have eccentric taste in ], or have eccentric ] or collections.
* ], 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==
Many of history's most brilliant minds have displayed many unusual behaviors and habits, and eccentricity is sometimes thought to be a sign of ]. However, many eccentrics are ]s, rather than geniuses.
* ], a London gentlemen's club
* '']''
* '']''


== See also ==
'''Extravagance''' is a kind of eccentricity, related to abundance and wastefulness.
* {{lookfrom|eccentric}}
* {{intitle|eccentric*}}
* ]


{{disambiguation}}
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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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