Same here. And I'm also interested in the related problem I (mis-)quoted (Thanks, Gene for your earlier reply to it): In terms of the girths, find the volume (4π/3)abc ... which may be easier than finding the semiaxes. —Dan Gene Salamin wrote: ----- Has anyone solved the problem of determining the axes of an ellipsoid given the three girths? It has me intrigued. The mathematics is more interesting than the politics of math.stackexchange. -----