# eccentricity

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## eccentricity,

in astronomy: see orbitorbit,
in astronomy, path in space described by a body revolving about a second body where the motion of the orbiting bodies is dominated by their mutual gravitational attraction.
.
Eccentricity

## eccentricity

Symbol: e . A measure of the extent to which an elliptical orbit departs from circularity. It is given by the ratio c /2a where c is the distance between the focal points of the ellipse and 2a is the length of the major axis. For a circular orbit e = 0. The planets and most of their satellites have an eccentricity range of 0–0.25 (see table). Many comets and some of the asteroids and planetary satellites have very eccentric orbits. The eccentricity of an orbit varies over a long period due to changing gravitational effects: that of the Earth's orbit varies between about 0.005 to 0.06 in a period of about 100 000 years. See also conic sections.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Eccentricity

in a conic section, a number equal to the ratio of a point’s distance from the focus to its distance from a directrix. The eccentricity characterizes the shape of a conic section. For example, two conic sections that have the same eccentricity are similar. The eccentricity of an ellipse is less than unity, that of a hyperbola is greater than unity, and that of a parabola is equal to unity. For the ellipse and hyperbola, the eccentricity may be defined as the ratio of the distances between the foci to the longer or real axis.

## eccentricity

[‚ek·sən′tris·əd·ē]
(mathematics)
The ratio of the distance of a point on a conic from the focus to the distance from the directrix.
(mechanics)
The distance of the geometric center of a revolving body from the axis of rotation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## Eccentricity

weird family, presented in grotesque domesticity. [TV: Terrace, I, 29]
Boynton, Nanny
travels with set of Encyclopaedia Britannica to settle disputes. [Am. Lit.: “Percy” in Stories, 634–644]
Dick, Mr.
odd but harmless old gentleman. [Br. Lit.: David Copperfield]
Doolittle, Doctor
veterinarian who talks to animals. [Children’s Lit.: Dr. Doolittle]
Flite, Miss
“ancient” ward in Chancery. [Br. Lit.: Bleak House]
Great-Aunt Dymphna
outlandish dresser who pointedly doesn’t eat meat. [Children’s Lit.: The Growing Summer, Fisher 124–127]
Havisham, Miss
jilted bride turns into witchlike old woman. [Br. Lit.: Great Expectations]
Longstocking, Pippi
outrageous, rebellious, imaginative child. [Children’s Lit.: Pippi Longstocking]
individualist; only girl “out of line.” [Children’s Lit.: Madeline, Fisher, 196]
delightfully pixilated old woman manages to exploit the Parisian exploiters. [Fr. Lit.: The Madwoman of Chaillot, Benét, 618]
Pickwick, Mr. (Samuel)
jolly “conformist” who understands anything but the obvious. [Br. Lit.: Pickwick Papers]
Poppins, Mary
English nanny who practises levitation, flies up chimneys, etc. [Children’s Lit.: Mary Poppins, Fisher, 218]
Salus, St. Simeon
behaved queerly to share outcasts’ contempt. [Christian Hagiog.: Attwater, 311]

## eccentricity

1. deviation from a circular path or orbit
2. a measure of the noncircularity of an elliptical orbit, the distance between the foci divided by the length of the major axis
3. Geometry a number that expresses the shape of a conic section: the ratio of the distance of a point on the curve from a fixed point (the focus) to the distance of the point from a fixed line (the directrix)
4. the degree of displacement of the geometric centre of a rotating part from the true centre, esp of the axis of rotation of a wheel or shaft
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Therefore the results for different eccentricities based on stages of breast development, atmospheric temperature and for different rate of evaporations are presented in the Tables 2 to 7.
(2) Effect of Varied Eccentricities on Vertical Displacements.
Thomas Tauris, affiliated with both, Argelander-Institut fur Astronomie and Max-Planck-Institut fur Radioastronomie (MPIfR) in Bonn, said that he was surprised when they looked at the calculated orbital periods and eccentricities predicted by our model, asserting that it gives an exact match with the observations.
He exudes generosity and open-mindedness concerning his own flaws and eccentricities as well as those of others, impressing a quirky sort of magnanimity on his readers.
For the evolution of the inclination, it is necessary to split Figure 12(a), for eccentricities up to 0.1 and Figure 12(b), for eccentricities from 0.5 to 0.9.
This model will also allow students to explore a range of conics with eccentricities ranging between 0.125 and 8.
Figure 12 shows the RT power curve for three different shaft eccentricities (E = 0%, 40.9%, and 56.2%).
Amin drew upon the archives of firms that included Louis Vuitton, Boucheron, Chaumet, Cartier, and Hermies, he had access to palace and private collections, and employing his own extensive expertise, has written a text that is as entertaining as it is informative in revealing the extraordinarily varied works commissioned by princes whose personal wealth was exceeded only by their eccentricities. As an impeccable work of scholarship in a coffee-table art book format, "Made For Maharajas" is especially recommended for academic library collections and would make a superb choice as a community library Memorial Fund acquisition.
The result is an apparently insignificant 2 degree eccentricity in plan, amplified in elevation, that disrupts the view from back to front as cramped elements annoyingly don't quite line up: one of a number of eccentricities that neither intentionally nor accidentally exploit the specificity of the site.
Temeraire is a delight, and readers who enjoy dragon tales will especially enjoy the details of various dragon breeds, the eccentricities of dragon behavior, the humanity of the dragons, and the excitement of dragon battles.
Memorable partnerships flourish when one member of the duo looks deeply into the artistry of the other and embraces his or her style, musicianship, and eccentricities. Among Natalia Makarova's many superb cavaliers, I have always felt that Ivan Nagy deserved pride of place.
In addition, almost all Hildas have orbital eccentricities between 0.1 and 0.25.

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