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Q&A How large does a spacecraft need to be to be visible from the surface of the Earth at 400 km altitude?

The angular resolution of the naked human eye is approximately one arc minute, or 1/60th of a degree. (Also a nice illustration of what this means in practice, which just so it happens also shows t...

posted 10y ago by Canina‭  ·  last activity 10y ago by Canina‭

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