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A comment on SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by tracking the stars. Parent comment

Re:SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by... by txnf on Monday September 25, 2023 @07:15PM (#37652070)
With a big enough aperture and low enough f-number you can definitely see the stars during daylight even from the ground
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