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I assume it would be the result of the planet being higher (less atmosphere to look through) and better seeing. Pupillodilation happens very quickly - less than a second. Further dark adaptation is a result of restoring the retina's visual pigments. For the naked eye planets, they are so bright that this is not relevant. I always observe these planets with a different eye to the one I use for DSOs as the planets themselves will end dark adaptation.
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