private static void CirclePoints(Gps[] points, Gps centre, double R, double r)
{
int count = points.Length;
Vector C = centre.ToUnitVector();
double t = r / R;
Vector K = Math.Cos(t) * C;
double s = Math.Sin(t);
Vector U = K.Orthogonal();
Vector V = K.Cross(U);
// Improve orthogonality
U = K.Cross(V);
for (int point = 0; point != count; ++point)
{
double a = 2 * Math.PI * point / count;
Vector P = K + s * (Math.Sin(a) * U + Math.Cos(a) * V);
points[point] = P.ToGps();
}
}
