I believe you can see sat's throughout the night. Maybe at all altitudes.
Although I haven't looked for years, I can recall visiting Rob McNaught late one night in the 80's at the now defunct and mothballed UK satellite research unit on Siding Spring as he imaged sats near the south celestrial pole.
Heavens Above site will plot for most satellites, rockets and upperstages etc. I particularly like the 'variable' sats.
Anybody observed 'Tiros n"? Try it.
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