Index: /trunk/MagicSoft/Mars/mastro/MAstroCatalog.cc
===================================================================
--- /trunk/MagicSoft/Mars/mastro/MAstroCatalog.cc	(revision 3706)
+++ /trunk/MagicSoft/Mars/mastro/MAstroCatalog.cc	(revision 3707)
@@ -30,5 +30,5 @@
 // SOME PARTS OF THE DRIVE SOFTWARE SOON!
 //
-// To display a starfiield you must have a supported catalog, then do:
+// To display a starfield you must have a supported catalog, then do:
 //
 //    MTime time;
@@ -68,7 +68,20 @@
 //  astrometrical corrections (nutation, precission, abberation, ...)
 //
-//  GUI: If the gui is interactive you can use the cursor keys to change
-//       the position you are looking at and with plus/minus you
-//       can (un)zoom the FOV (Field Of View)
+//  GUI:
+//    * If the gui is interactive you can use the cursor keys to change
+//      the position you are looking at and with plus/minus you
+//      can (un)zoom the FOV (Field Of View)
+//
+//    * The displayed values mean the following:
+//        + alpha: Right Ascension
+//        + delta: Declination
+//        + theta: zenith distance / zenith angle
+//        + phi:   azimuth angle
+//        + rho:   angle of rotation sky-coordinate system vs local-
+//                 coordinate system
+//        + time of display
+//
+//    * Move the mouse on top of the grid points or the stars to get
+//      more setailed information.
 //
 //  ToDo: