Satellite schedules are well known. It doesn’t matter how good your cameras are when everyone knows when they’ll be overhead.
An SR-71 can appear quicker than you can camouflage something you’re attempting to relocate in mid-move.
Maybe Aurora or some other ‘technology sufficiently advanced, to be indistinguishable from magic’ to paraphrase Clarke’s law...
“An SR-71 can appear quicker than you can camouflage something you’re attempting to relocate in mid-move.”
True. But then the SR-71 sortie rate was pretty low throughout much of it’s history. Add in the fact that they only operated from 3 bases (Bases that were undoubtedly watched for departures & arrivals). For instance, any departure from RAF Mildenhall was pretty much guaranteed to be heading up toward the Kola Peninsula of the Soviet Union. You wouldn’t need to see it leave... you’d hear it.