private CarteseanCoordinate AltAzToCartesean(double[] altAz)
{
// The next line replaces AxesToSpherical,
var result = new CarteseanCoordinate();
double radius = 90f - altAz[0];
// Avoid division 0 errors
if (Math.Abs(radius) < 0.0000001)
{
radius = 1;
}
// Get the cartesian coordinates
double azRadians = AstroConvert.DegToRad(altAz[1]);
var x = Math.Sin(azRadians);
var y = -Math.Cos(azRadians);
// Get unit vector
result[0] = x * radius;
result[1] = y * radius;
return(result);
}