diff --git a/apps/openmw/mwrender/sky.cpp b/apps/openmw/mwrender/sky.cpp
index 0b9dc091e..454ed8820 100644
--- a/apps/openmw/mwrender/sky.cpp
+++ b/apps/openmw/mwrender/sky.cpp
@@ -187,6 +187,8 @@ Moon::Moon( const String& textureName,
 {
     setVisibility(1.0);
 
+    mMaterial->setProperty("alphatexture", sh::makeProperty(new sh::StringValue(textureName + "_alpha")));
+
     mPhase = Moon::Phase_Full;
 }
 
@@ -215,9 +217,15 @@ void Moon::setPhase(const Moon::Phase& phase)
     textureName += ".dds";
 
     if (mType == Moon::Type_Secunda)
+    {
         sh::Factory::getInstance ().setTextureAlias ("secunda_texture", textureName);
+        sh::Factory::getInstance ().setTextureAlias ("secunda_texture_alpha", "textures\\tx_mooncircle_full_s.dds");
+    }
     else
+    {
         sh::Factory::getInstance ().setTextureAlias ("masser_texture", textureName);
+        sh::Factory::getInstance ().setTextureAlias ("masser_texture_alpha", "textures\\tx_mooncircle_full_m.dds");
+    }
 
     mPhase = phase;
 }
diff --git a/files/materials/moon.shader b/files/materials/moon.shader
index eb7243d3f..0e1a4ffc8 100644
--- a/files/materials/moon.shader
+++ b/files/materials/moon.shader
@@ -38,16 +38,14 @@ shUniform(float4x4, projection) @shAutoConstant(projection, projection_matrix)
 
     SH_START_PROGRAM
     {
-        
-        float4 tex = shSample(diffuseMap, UV);
-        
-        shOutputColour(0) = float4(materialEmissive.xyz, 1) * tex;
-        
-        shOutputColour(0).a = shSample(alphaMap, UV).a * materialDiffuse.a;
-        
-        shOutputColour(0).rgb += (1.0-tex.a) * shOutputColour(0).a * atmosphereColour.rgb; //fill dark side of moon with atmosphereColour
-        shOutputColour(0).rgb += (1.0-materialDiffuse.a) * atmosphereColour.rgb; //fade bump
+        float4 phaseTex = shSample(diffuseMap, UV);
+        float4 fullCircleTex = shSample(alphaMap, UV);
+
+        shOutputColour(0).a = max(phaseTex.a, fullCircleTex.a) * materialDiffuse.a;
 
+        shOutputColour(0).xyz = fullCircleTex.xyz * atmosphereColour.xyz;
+        shOutputColour(0).xyz = shLerp(shOutputColour(0).xyz, phaseTex.xyz, phaseTex.a);
+        shOutputColour(0).xyz *= materialEmissive.xyz;
     }
 
 #endif
diff --git a/files/materials/sky.mat b/files/materials/sky.mat
index ccf2a8053..c2e8ddeb0 100644
--- a/files/materials/sky.mat
+++ b/files/materials/sky.mat
@@ -50,7 +50,7 @@ material openmw_moon
         
         texture_unit alphaMap
         {
-            direct_texture textures\tx_secunda_full.dds
+            texture_alias $alphatexture
         }
     }
 }