diff --git a/src/Cesium/Ellipsoid.cs b/src/Cesium/Ellipsoid.cs
index f58cec9..5db0584 100644
--- a/src/Cesium/Ellipsoid.cs
+++ b/src/Cesium/Ellipsoid.cs
@@ -5,8 +5,8 @@ public class Ellipsoid
     public Ellipsoid()
     {
         SemiMajorAxis = 6378137;
-        SemiMinorAxis = 6356752.3142478326;
-        Eccentricity = 0.081819190837553915;
+        SemiMinorAxis = 6356752.314245179;
+        Eccentricity = 0.08181919084262157;
     }
     public double SemiMajorAxis { get; }
     public double SemiMinorAxis { get; }