diff --git a/src/defs.txt b/src/defs.txt
index 479f917..cfb95fe 100644
--- a/src/defs.txt
+++ b/src/defs.txt
@@ -154,6 +154,7 @@ actor 0 0 0 io
     orbit 421700e3 0.65
     scale 1822e3
     rotationy -0.40
+    rotationx -0.50
     angularmomentum 0 0.0001 0
     sphere yes
     moon yes
@@ -166,6 +167,7 @@ actor 0 0 0 europa
     orbit 670900e3 0.35
     scale 1561e3
     rotationy 0.20
+    rotationx -0.50
     angularmomentum 0 0.0001 0
     sphere yes
     moon yes
@@ -178,6 +180,7 @@ actor 0 0 0 ganymede
     orbit 1070400e3 0.93
     scale 2634e3
     rotationy -0.40
+    rotationx -0.50
     angularmomentum 0 0.0001 0
     sphere yes
     moon yes
@@ -190,6 +193,7 @@ actor 0 0 0 callisto
     orbit 1882700e3 0.45
     scale 2410e3
     rotationy -0.40
+    rotationx -0.50
     angularmomentum 0 0.0001 0
     sphere yes
     moon yes