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Of course, the higher you fly the less atmosphere thus the brighter the stars,
visible by the human eye if at SR71 heights.

Craig

I have seen references to daytime star sightings by the Astrotracker system
that was used  to navigate the SR-71 'spyplane'.  Apparently, the system was
completely automatic and the starlight was detected by a photomultiplier
tube. No visual observations were required.

I also recall references to a different scale for measuring the brightness
of the stars because the spectral sensitiviy of  the auto-tracker sensor is
different then that of the human eye.

   

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