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Hmmm interesting.
Now I always thought the 'ground atmosphere' had as much to do with seeing as the high atmosphere. Otherwise why would they place observatories on high points?
Local conditions play a big part too...hill and mountain ranges..heat haze..sea breezes..wind directions. I'm only 60 Kms from Rumples Riot but theres a big difference in seeing conditions.He's posted shots at times thats had me scratching my head how he got them and other times its been perfect here but not for him.
Dont know the answer to this one,for me I know my location and the best conditions.Summer time here produces the best seeing more often than winter.
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