diff --git a/NewHorizons/Builder/Orbital/InitialMotionBuilder.cs b/NewHorizons/Builder/Orbital/InitialMotionBuilder.cs
index 969347f3..60095799 100644
--- a/NewHorizons/Builder/Orbital/InitialMotionBuilder.cs
+++ b/NewHorizons/Builder/Orbital/InitialMotionBuilder.cs
@@ -129,7 +129,7 @@ namespace NewHorizons.Builder.Orbital
             var tru = secondaryBody.trueAnomaly;
 
             // Update their astro objects
-            primaryBody.SetOrbitalParametersFromTrueAnomaly(ecc, r1, inc, arg - 180, lon, tru);
+            primaryBody.SetOrbitalParametersFromTrueAnomaly(ecc, r1, inc, arg, lon - 180, tru);
             secondaryBody.SetOrbitalParametersFromTrueAnomaly(ecc, r2, inc, arg, lon, tru);
 
             primaryBody.transform.position = baryCenter.transform.position + primaryBody.GetOrbitalParameters(primaryGravity, secondaryGravity).InitialPosition;