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someplaceguy
on Sept 26, 2023
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The SR-71 Blackbird Astro-Nav System worked by tra...
According to the documentation of the Astro-Nav System, it is designed to operate in polar areas [1].
[1]
https://airandspace.si.edu/webimages/collections/full/NAS-14...
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[1] https://airandspace.si.edu/webimages/collections/full/NAS-14...