diff --git a/OemLoader/EarthSystemArtemis.xml b/OemLoader/EarthSystemArtemis.xml
new file mode 100644
index 0000000..a246041
--- /dev/null
+++ b/OemLoader/EarthSystemArtemis.xml
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- This will be populated by the KittenExtensions patch. -->
+<System Id="SolLiteArtemis" />
\ No newline at end of file
diff --git a/OemLoader/OemLoader.csproj b/OemLoader/OemLoader.csproj
index 0b22c8c..9ddc236 100644
--- a/OemLoader/OemLoader.csproj
+++ b/OemLoader/OemLoader.csproj
@@ -9,7 +9,7 @@
     </PropertyGroup>
 
     <PropertyGroup>
-      <Version>0.0.4-alpha</Version>
+      <Version>0.0.5-alpha</Version>
     </PropertyGroup>
   
     <ItemGroup>
@@ -158,6 +158,12 @@
       <None Update="mod.toml">
         <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       </None>
+      <None Update="SystemPatch.xml">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+      <None Update="EarthSystemArtemis.xml">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
     </ItemGroup>
   
     <Target Name="CopyLicense" AfterTargets="Publish">
diff --git a/OemLoader/SystemPatch.xml b/OemLoader/SystemPatch.xml
new file mode 100644
index 0000000..0914591
--- /dev/null
+++ b/OemLoader/SystemPatch.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Add a version of Luna that uses up-to-date lunar ephemerides for Artemis II,
+and a version of the "Earth and Moon" system using our new Luna. -->
+<Patch>
+    <!-- Create a copy of Luna with our new orbital parameters. -->
+    <With Path="/Root/Mod[@Id='Core']/Assets[@RelPath='Astronomicals.xml']">
+        <Copy Path="." From="PlanetaryBody[@Id='Luna']" Pos="Append" />
+        <With Path="PlanetaryBody[@Id='Luna'][2]">
+            <Copy Path="@Id" Pos="Append">_Artemis2</Copy>
+            <With Path="Orbit">
+                <!-- These were calculated by taking state vectors from JPL Horizons for 2026-04-06 00:00:00,
+                then using KSA's code itself to calculate the orbital parameters from there. -->
+                <Copy Path="SemiMajorAxis/@Km">387963.5088026329</Copy>
+                <Copy Path="Inclination/@Degrees">4.846183409176521</Copy>
+                <Copy Path="Eccentricity/@Value">0.04454421197470557</Copy>
+                <Copy Path="LongitudeOfAscendingNode/@Degrees">355.91022384961406</Copy>
+                <Copy Path="ArgumentOfPeriapsis/@Degrees">84.66494941290519</Copy>
+                <Copy Path="TimeAtPeriapsis/@Seconds">298420.41735839844</Copy>
+            </With>
+        </With>
+    </With>
+    
+    <!-- Populate our custom systems with the contents of the corresponding default systems,
+    but use our new custom version of Luna. -->
+    <With Path="/Root/Mod[@Id='OemLoader']">
+        <Copy Path="System[@Id='SolLiteArtemis']" From="/Root/Mod[@Id='Core']/System[@Id='SolLite']/*" Pos="Append" />
+        <With Path="System">
+            <Copy Path="DisplayName/@Value" Pos="Append"> (April 2026 lunar ephemerides)</Copy>
+            <Copy Path="LoadFromLibrary[@Id='Luna']/@Id" Pos="Append">_Artemis2</Copy>
+        </With>
+    </With>
+</Patch>
\ No newline at end of file
diff --git a/OemLoader/mod.toml b/OemLoader/mod.toml
index 9f40142..21b613a 100644
--- a/OemLoader/mod.toml
+++ b/OemLoader/mod.toml
@@ -1,5 +1,8 @@
 name = "OemLoader"
 
+patches = [ "SystemPatch.xml" ]
+systems = [ "EarthSystemArtemis.xml" ]
+
 [StarMap]
 EntryAssembly = "OemLoader"
 ExportedAssemblies = []
@@ -7,3 +10,7 @@ ExportedAssemblies = []
 [[StarMap.ModDependencies]]
 ModId = "ModMenu"
 Optional = false
+
+[[StarMap.ModDependencies]]
+ModId = "KittenExtensions"
+Optional = false
\ No newline at end of file