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I am trying to bin the unit sphere so that each bin has approximately equal area on the sphere. I hope binning the azimuthal angle (0...2*pi) to equal bin widths. Then i need to bin the polar angle(0...pi) so that at poles(angles close to 0 and pi) bin widths are large and close to equator(angles close to pi/2) the bin widths are small. I would appreciate any kind of help for binning the polar angles for non-equal bin widths.

Thanks in advance.

Susantha