[elliptical galaxies] The fundamental plane is a relationship between the effective radius, average surface brightness and central velocity dispersion of normal elliptical galaxies. Any one of the three parameters may be estimated from the other two, as together they describe a plane that falls within their more general three-dimensional sp...
Found on
http://en.wikipedia.org/wiki/Fundamental_plane_(elliptical_galaxies)
[spherical coordinates] The fundamental plane in a spherical coordinate system is a plane which divides the sphere into two hemispheres. The latitude of a point is then the angle between the fundamental plane and the line joining the point to the centre of the sphere. For a geographic coordinate system of the Earth, the fundamental plane is...
Found on
http://en.wikipedia.org/wiki/Fundamental_plane_(spherical_coordinates)
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