People have mentioned a lot of great apps here for both Android and iOS. What they forget is that all those apps get their information from somewhere and a lot

People have mentioned a lot of great apps here for both Android and iOS. What they forget is that all those apps get their information from somewhere and a lot of it is coming from hobbyists and amateur astronomers putting it up on http://www.heavens-above.com http://www.heavens-above.com and SeeSat mailing list for free (yes, a lot of space-celebs like Hubble and ISS have a known orbit, but those guys have catalogued virtually every object launched by humans, including many top-secret satellites). Just thought it is appropriate to give respect where respect is due.