As the algorithm/admins don't like posts without a location, I'll say I'm in Dearne Valley, South Yorkshire. But the post is more for advice. A couple of weeks ago I saw a flashing blue/purple light kind of bouncing in the sky, and because I'm new to this, and cannot distinguish prosaic phenomenon from UAP, thought I'd download a flight tracker app. I've used it in the day with nothing exciting showing. Tonight has been the first night Its been clear and warm enough to sit out for a while, an...