The ISS (International Space Station) replaces the old Russian station Mir, which was taken out of service a few years ago. Since the ISS is constantly being expanded, using NASA's Space Shuttle as ferry, it appears brighter and brighter in the late evening/night sky. Satellites like the ISS are in low orbits around Earth and will be in the dark shadow of Earth most of the time they are on the night-side of Earth, so you have to look for such satellites not late after sunset or before sunrise.
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