diff --git a/nav.py b/nav.py
index 517ef1f..6adcb9b 100644
--- a/nav.py
+++ b/nav.py
@@ -17,7 +17,7 @@ DISTANCES = {
     ("gateway", "venus"): 41.0,
     ("mars", "phobos"): 0.01,
     ("mars", "deimos"): 0.02,
-    ("venus", "mercury"): 50.0,
+    ("venus", "mercury"): 48.0,
     ("mars", "ceres"): 265.0,
     ("gateway", "milliways"): 42.0,
     ("ceres", "vesta"): 96.0,