Get an nside such that all points belong
to different pixels, when the minimum
distance between the points is
The minimum distance between any two points in a data.frame of points that lie on S^2
Allows changing the shrinkage factor for the circlular pixels (radius = dist*factor).
We treat pixels as circles. From the total surface
area of a unit sphere and the radius of a circle with
area 4*pi/(12*nside^2), we derive a sufficiently
large nside to achieve the desired separation. We
aim for (circular) pixels with (default)
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