Hi!
Just saw ISS at 22:25 CET! What's interesting is that it wasn't mentioned in Heavens Above. The sky was clear blue (well, not that clear...but still, no star to see and yet, ISS, appeared. I knew ISS would pass 96 minutes later (mentioned) and substracted those minutes, set the watch so that it would beep on time. I rushed upstairs, opened the window and sure enough!! Apparently, H-A only mentions passes when the Sun is lower than 8 degrees below the horizon. It wasn't yet, and still, ISS was bright enough!
ISS apparently can be seen entering Earth's shadow and reappearing outside it, within a few minutes. But this requires some preparation and calculation.
Raoul