Elliptic Coordinates
In geometry, the elliptic coordinate system is a two-dimensional orthogonal coordinate system in which the coordinate lines are confocal ellipses and hyperbolae. The two foci F_ and F_ are generally taken to be fixed at -a and +a, respectively, on the x-axis of the Cartesian coordinate system. Basic definition The most common definition of elliptic coordinates (\mu, \nu) is : x = a \ \cosh \mu \ \cos \nu : y = a \ \sinh \mu \ \sin \nu where \mu is a nonnegative real number and \nu \in , 2\pi On the complex plane, an equivalent relationship is : x + iy = a \ \cosh(\mu + i\nu) These definitions correspond to ellipses and hyperbolae. The trigonometric identity : \frac + \frac = \cos^ \nu + \sin^ \nu = 1 shows that curves of constant \mu form ellipses, whereas the hyperbolic trigonometric identity : \frac - \frac = \cosh^ \mu - \sinh^ \mu = 1 shows that curves of constant \nu form hyperbolae. Scale factors In an orthogonal coordinate system the lengths of the ...
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Elliptical Coordinates Grid
Elliptical may mean: * having the shape of an ellipse, or more broadly, any oval shape ** in botany, having an elliptic leaf shape ** of aircraft wings, having an elliptical planform * characterised by ellipsis (the omission of words), or by concision more broadly * an elliptical trainer, an exercise machine See also * Ellipse (other) * Ellipsis (other) An ellipsis is a punctuation mark comprised a series of dots: ... "Ellipsis" may also refer to: Arts * Ellipsis (narrative device) Ellipsis is the narrative device of omitting a portion of the sequence of events, allowing the reader to fill in ...