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Thanks for all the answers. That Pickering animation is great.
I guess I was just unclear about the difference between seeing, transparency and cloud cover. Someone kindly sent me a good summary via private message, along with a nicely detailed description of FWHM - something else I was unclear about.
Now I think I understand; you can have good transparency, but still have less than great seeing due to jetstreams etc. Cloud cover will ruin both transparency and seeing. Do I have that right?
Also, are you saying I should be able to see just by the naked eye whether the stars above about 40 degrees are twinkling, or through a telescope?
I'm trying imaging again tonight, it's clicking away right now, but I have to say the subs are looking a lot darker than I was hoping. Is there a time of night when the seeing is usually better or worse? Is it always better in the hours before sunrise, or is that just for meteor showers?
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