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Oh yes, I was aware that the lower the altitude, the more atmosphere you're looking through. I'm looking for a similar correlation only to do with altitude alone.
So if zenith at sea-level is 1 atmosphere thickness, how many atmosphere thicknesses is it at 1000m?
Curious. Of course, there is more to it than that - bad layers in the atmosphere and mixing of air currents add complication to the model, but obviously it makes a difference since professional observatories tend to be on top of mountains.
Markus
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