diff --git a/src/ol/proj.js b/src/ol/proj.js
index 4af03b0f42..66b8fb21bd 100644
--- a/src/ol/proj.js
+++ b/src/ol/proj.js
@@ -1,6 +1,7 @@
 goog.provide('ol.proj');
 
 goog.require('ol');
+goog.require('ol.Sphere');
 goog.require('ol.extent');
 goog.require('ol.proj.EPSG3857');
 goog.require('ol.proj.EPSG4326');
@@ -9,7 +10,6 @@ goog.require('ol.proj.Units');
 goog.require('ol.proj.proj4');
 goog.require('ol.proj.projections');
 goog.require('ol.proj.transforms');
-goog.require('ol.sphere.NORMAL');
 
 
 /**
@@ -21,6 +21,14 @@ goog.require('ol.sphere.NORMAL');
 ol.proj.METERS_PER_UNIT = ol.proj.Units.METERS_PER_UNIT;
 
 
+/**
+ * A place to store the radius of the Clarke 1866 Authalic Sphere.
+ * @private
+ * @type {ol.Sphere}
+ */
+ol.proj.AUTHALIC_SPHERE_ = new ol.Sphere(6370997);
+
+
 if (ol.ENABLE_PROJ4JS) {
   /**
    * Register proj4. If not explicitly registered, it will be assumed that
@@ -80,9 +88,9 @@ ol.proj.getPointResolution = function(projection, resolution, point) {
         point[0], point[1] + resolution / 2
       ];
       vertices = toEPSG4326(vertices, vertices, 2);
-      var width = ol.sphere.NORMAL.haversineDistance(
+      var width = ol.proj.AUTHALIC_SPHERE_.haversineDistance(
           vertices.slice(0, 2), vertices.slice(2, 4));
-      var height = ol.sphere.NORMAL.haversineDistance(
+      var height = ol.proj.AUTHALIC_SPHERE_.haversineDistance(
           vertices.slice(4, 6), vertices.slice(6, 8));
       pointResolution = (width + height) / 2;
       var metersPerUnit = projection.getMetersPerUnit();
diff --git a/src/ol/sphere/normal.js b/src/ol/sphere/normal.js
deleted file mode 100644
index 70e6f8e165..0000000000
--- a/src/ol/sphere/normal.js
+++ /dev/null
@@ -1,11 +0,0 @@
-goog.provide('ol.sphere.NORMAL');
-
-goog.require('ol.Sphere');
-
-
-/**
- * The normal sphere.
- * @const
- * @type {ol.Sphere}
- */
-ol.sphere.NORMAL = new ol.Sphere(6370997);