ELLtoXYZ

Convert elliptic coordinate to cartesian coordinate.

This is a magic function I directly copy from original VSOP2013.

It's way beyond my math level.

So I can't find how to inverse XYZ elements to ELL elements.

static double[] ELLtoXYZ(double[] ell)

Parameters

ell double[]

Array of elliptic coordinate elements

Return

double[]

Array of cartesian coordinate elements