From: Explicitly computing geodetic coordinates from Cartesian coordinates
Region | Real number solutions | Complex number solutions | Right real number solution |
---|---|---|---|
Outside the evolute | P1, P2, P3, P4 | none | P 1 |
On the evolute | P1, P2, P3, P4 (P2 = P4) | none | P 1 |
Inside the evolute* | P3, P4 | P1, P2 | P 4 |