[MalcolmDwyer]

The cutoff is nowhere near that soon after sunset. At midnight? Sure, you're not going to see satellites. But against a dark sky, you can see satellites reflecting for at least a couple hours. They may not be in direct sunlight as it gets later, but they are still illuminated by the atmosphere on the sunny side for a while.

[adastra22]

Not low earth orbit satellites. As the name implies, those are flying low enough that they’re only briefly visible after sunset.

[NikkiA]

The human eye might not, but they show up just fine in astrophotography, amateur or professional, all night long.