# 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.

## 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.

## 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
References in periodicals archive ?
a]=33[degrees]C, different values of rate of evaporation, different eccentricities [d.
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.
This model will also allow students to explore a range of conics with eccentricities ranging between 0.
In addition, almost all Hildas have orbital eccentricities between 0.
By the end of it you may, like Dessaix himself, find yourself "warming to the idea of re-reading Turgenev": or, even, of reading Turgenev for the first time with Twilight of Love beside you as a sort of rough guide to some of Turgenev's eccentricities, tribulations and loves.
The question becomes one of accommodation; the problem is precisely how to curate a history of projects so dependent on desublimatory gestures born of the lamentable eccentricities of collections.
Because Arnold is a genuine international movie star--and because France, whatever its eccentricities, is not in the habit of electing the stars of second-rate action movies to senior political positions--Arnold got much more coverage in the French press than the typical candidate for governor in California.
The book's acutely-hewn historical edge knowingly shaves off Vaughan's visionary eccentricities, a winnowing that leaves West occasionally claiming, in my view, a great deal for some poems ("The Palm Tree" and "St.
Even now, when one thinks of Greenwich Village, one thinks of the eccentricities of that bygone era.
The updated Rite as a whole "aims to recover a sense of mystery and contemplation" said the English weekly The Universe, "reducing the chatter and eccentricities which have crept into some parishes.

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