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DanielLC comments on Rationality: Appreciating Cognitive Algorithms - LessWrong
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I consider anything that is contiguously attached to the planet (or moon) which I am currently on (e.g. a man on a mountaintop), or less than about two metres from the ground (e.g. a man jumping up and down) to not be in the sky. Anything further than that from ground surface, and either currently ascending or able to maintain that altitude, counts as 'in the sky'; anything further than that from ground surface and not able to maintain that altitude, counts as 'falling from the sky'.
I'd say that it has to be far enough from the ground that you wouldn't notice the parallax effect if you walked around below it, it has to be above the horizon. Also, it can't be an airplane or something. I'm not sure why exactly that last rule is there, given that meteors and such count. Maybe most people would consider it part of the sky. I'd say it's in the sky, but not part of it.