diff --git a/GameData/LunarTransferPlanner/Plugins/LunarTransferPlanner.dll b/GameData/LunarTransferPlanner/Plugins/LunarTransferPlanner.dll
index 212dd5d..865a377 100644
Binary files a/GameData/LunarTransferPlanner/Plugins/LunarTransferPlanner.dll and b/GameData/LunarTransferPlanner/Plugins/LunarTransferPlanner.dll differ
diff --git a/LunarTransferPlanner.cs b/LunarTransferPlanner.cs
index bcf3b46..501079a 100644
--- a/LunarTransferPlanner.cs
+++ b/LunarTransferPlanner.cs
@@ -269,20 +269,23 @@ private OrbitData CalcOrbitForTime(CelestialBody target, Vector3d launchPos, dou
             double targetTime = Planetarium.GetUniversalTime() + flightTime * 24d * 3600d + delayTime;
             Vector3d targetPos = target.getPositionAtUT(targetTime);
 
-            Vector3d upVector = Quaternion.AngleAxis((float)(delayTime * 360d / mainBody.rotationPeriod), EarthAxis) * (launchPos - EarthPos).normalized;
+            Vector3d upVector = QuaternionD.AngleAxis(delayTime * 360d / mainBody.rotationPeriod, EarthAxis) * (launchPos - EarthPos).normalized;
 
             Vector3d orbitNorm = Vector3d.Cross(targetPos - EarthPos, upVector).normalized;
-            double inclination = Math.Acos(Vector3d.Dot(orbitNorm, mainBody.angularVelocity.normalized));
+            double inclination = Math.Acos(Vector3d.Dot(orbitNorm, EarthAxis));
             if (inclination > Math.PI / 2)
+            {
                 inclination = Math.PI - inclination;
+                orbitNorm *= -1; // make sure orbitNorm always points roughly northwards
+            }
 
-            Vector3d eastVec = Vector3d.Cross(EarthAxis, upVector).normalized;
+            // When checking this: remember that Unity (and KSP) use a left-handed coordinate system; therefore, the
+            // cross product follows the left-hand rule.
+            Vector3d eastVec = Vector3d.Cross(upVector, EarthAxis).normalized;
             Vector3d northVec = Vector3d.Cross(eastVec, upVector).normalized;
             Vector3d launchVec = Vector3d.Cross(upVector, orbitNorm).normalized;
 
             double azimuth = Math.Acos(Vector3d.Dot(launchVec, northVec));
-            if (Vector3d.Dot(launchVec, eastVec) < 0d)
-                azimuth = Math.PI - azimuth;
 
             return new OrbitData(orbitNorm, inclination * 180d / Math.PI, azimuth * 180d / Math.PI);
         }
@@ -293,7 +296,7 @@ private double EstimateLaunchTime(CelestialBody target, Vector3d launchPos, doub
             double t = startTime;
             OrbitData launchOrbit = CalcOrbitForTime(target, launchPos, t);
 
-            if (latitude >= target.orbit.inclination)
+            if (Math.Abs(latitude) >= target.orbit.inclination)
             {
                 // High latitude path - find the next easterly launch to the target
                 while (Math.Abs(launchOrbit.azimuth - targetAz) > 0.01d)
@@ -424,10 +427,10 @@ void MakeMainWindow(int id)
 
                     GUILayout.Space(4);
                     GUILayout.Label("Launch Now Incl", GUILayout.ExpandWidth(true));
-                    GUILayout.Box(new GUIContent($"{(launchOrbit.azimuth > 90d ? -launchOrbit.inclination : launchOrbit.inclination):F2}°",
+                    GUILayout.Box(new GUIContent($"{(launchOrbit.azimuth > 90d ? -launchOrbit.inclination : launchOrbit.inclination):F2}°",
                         "Launch to this inclination now to reach a Lunar parking orbit"), GUILayout.MinWidth(100));
 
-                    string tooltip = latitude >= target.orbit.inclination ?
+                    string tooltip = Math.Abs(latitude) >= target.orbit.inclination ?
                         "Launch at this time for an Easterly launch to Lunar parking orbit" :
                         "Launch at this time for a low inclination launch to Lunar parking orbit";
 
diff --git a/LunarTransferPlanner.csproj b/LunarTransferPlanner.csproj
index b84d252..89b632f 100644
--- a/LunarTransferPlanner.csproj
+++ b/LunarTransferPlanner.csproj
@@ -84,14 +84,15 @@
     <None Include="README.md" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <PropertyGroup>
-    <PostBuildEvent>xcopy /y "$(TargetPath)" "$(ProjectDir)/GameData/LunarTransferPlanner\Plugins\"</PostBuildEvent>
-  </PropertyGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">
   </Target>
+  -->
   <Target Name="AfterBuild">
+    <Copy
+      SourceFiles="$(TargetPath)"
+      DestinationFolder="$(ProjectDir)/GameData/LunarTransferPlanner/Plugins"
+      SkipUnchangedFiles="false" />
   </Target>
-  -->
-</Project>
\ No newline at end of file
+</Project>