Index: trunk/FACT++/scripts/Main.js
===================================================================
--- trunk/FACT++/scripts/Main.js	(revision 14770)
+++ trunk/FACT++/scripts/Main.js	(revision 14771)
@@ -254,8 +254,11 @@
 {
     var horizon_parameter = "nautical"
-    if (Sun.horizon( horizon_parameter ).isUp)
-    {
-        console.out(JSON.stringify(Sun.horizon( horizon_parameter )));
-        throw new Error("Sun is above FACT-horizon, lid cannot be opened.");
+    while (Sun.horizon( horizon_parameter ).isUp)
+    {
+       var minutes_until_sunset = (Sun.horizon( horizon_parameter ).set - new Date())/60000;
+       console.out("Open Lid - Info: ");
+       console.out("    Sun is above FACT-horizon, lid cannot be opened.");
+       console.out("    sleeping " + minutes_until_sunset + "minutes ...");
+       v8.sleep(60000);
     }