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I interpreted this traditional “astro saying” as being based on the predominant use of our eyes in the daytime to distinguish bright, colourful and high contrast scenes, using stereo vision. When confronted with a new low contrast, Cyclops-like view, shimmering in an “unnatural” eyepiece field, this takes some getting used to before we can begin to see the subtle details on the planets.
It is also quite amazing to witness the incredible spectrum of responses at public star parties; some people have a “wow” experience and articulate it very loudly, others seem to be quite unimpressed and just shuffle on.
Cheers
Dennis
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