Re: Astronomical League "seeing and transparency"
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Oh. Good luck on quantifying so subjective a thing as seeing and transparency. I have no doubt that there is a range of possibilities but finding an objective standard is I fear a fools errand. It so depends on the observer, his or her experience, what instrument they are using, and what moment they choose to assign a qualitative assessment of both. All these categories are questionable.
Some one who observes double stars constantly probably has a much better understanding than the casual observer. Today there are few dedicated double star observers understandably. I pick double stars as they seem to me to be the simplest standard for judging seeing limits. I have heard seasoned observers state that the atmosphere here allows only a three arc second discrimination. In my experience that is far too pessimistic. Kent and I have observed doubles to around 0.89 arc second separation on a regular basis. This just shows how variable the definitions are, not that Kent or I are the final word on what is possible. Not even close. It can also change within the space of a half an hour.
So what to do? I have a set of standard test stars that give a good guide to seeing assessment.
That said, the standard you enclose seems reasonable enough as a personal standard.
On Friday, February 5, 2021, 6:59:34 PM EST, Jim Tallman <jctallman@...> wrote:
You do know you can make your owe observing log, print it out, and keep it in a binder?