No. It's like using a mirror to signal an aeroplane, except in this case the satellite is the mirror and you're the aeroplane. The satellite could be anywhere in the sky, so long as one of its flat surfaces is making equal angles with the Sun and your location. As the satellite moves, it sweeps a track of reflected sunlight across the Earth, brightest in the centre of the track. If you go and stand in the track, you see a bright light at the satellite's position in your sky.Evil Dr Ganymede wrote: If I'm right under the flare centre, shouldn't I have to be looking straight up since it'd be directly overhead?