Jan 11 2010

links for 2010-01-10

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Jan 08 2010

links for 2010-01-07

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  • In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a point is specified by three numbers: the radial distance of that point from a fixed origin, its elevation angle measured from a fixed plane, and the azimuth angle of its orthogonal projection on that plane, measured from a fixed reference direction on the same. The elevation angle is often replaced by the inclination angle measured from a zenith direction perpendicular to the reference plane.

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Jan 04 2010

links for 2010-01-03

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Jan 02 2010

links for 2010-01-01

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Jan 01 2010

links for 2009-12-31

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