Fix Age celestial path rotation

src/main/java/net/dnorberg/rivencraft/mixin/client/LevelRendererMixin.java

@@ -10,7 +10,7 @@ import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Redirect;
 
-/** Tilts the vanilla sun, moon, and star plane by each Age's saved angle. */
+/** Rotates the vanilla sun, moon, and star path by each Age's saved angle. */
 @Mixin(LevelRenderer.class)
 public abstract class LevelRendererMixin {
     @Shadow
@@ -26,6 +26,10 @@ public abstract class LevelRendererMixin {
     )
     private Quaternionf rivencraft$rotateCelestialPlane(Axis axis, float degrees) {
         float angle = ClientAgeCelestialAngles.get(level.dimension());
-        return new Quaternionf(Axis.ZP.rotationDegrees(angle)).mul(axis.rotationDegrees(degrees));
+        // Vanilla's -90 degree Y rotation fixes every sunrise to the same
+        // east/west line. Offset that rotation around the world's vertical
+        // axis so the saved Age angle changes the compass direction of the
+        // entire sun, moon, and star path.
+        return axis.rotationDegrees(degrees + angle);
     }
 }