skymap tutorial img

README-skymap.md

@@ -58,14 +58,22 @@ That's a 24h prediction for BW3 for the example location.
 * Orange tracks are in sunlight but during daytime.
 * Yellow tracks are in sunlight but during night time.
 
-
 The example has two passes during night time:
 
 * Low South East.
 * Low South West.
 
 In interactive mode, use `l` to change the track length to 3600 secs (1 hour).
+To use `skymap` in interactive mode, launch `skymap` from the command line.
+When you hit `l` in the graphical display, the prompt will be in the terminal
+window.
+
 Then use `.` to move time forward with these 1 hour steps.
+It makes it faster if `skymap` is run without drawing stars until needed,
+especially during frequent re-renders.
+Disable viewing stars with `shift-Q`.
+
+![skymap tutorial 2](img/skymap-tutorial-02.png)
 
 At some point you'll get the first pass.
 Then use `<` a few times to reduce the timestep size to something like 450 seconds.