Quote:
Originally Posted by billdan
Problem is the seeing varies across the sky, seeing at 30° elevation is going to be a lot more than it is at zenith. It will also vary depending on the time of night, worst before 10pm and then gets better until around 3 am.
So I don't think measuring it, is really going to help much.
Bill
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Well in terms of absolutes, isn't it better to measure it during that period when it is at its best. And really how many imagers are running subs at 30 degrees Alt. I would suggest target doubles above 40-45 degrees up to zenith, in that period from 10pm to 3am. Of course, it is usually worse at this time of year due to earth heat retention and cool down, but if you pick similiar nights and average the results it should be useful.
I would take a small generator, or battery and inverter suitable for running my laptop and mount, camera etc and use one of the astro tools that can calculate, plot, etc FWHM. If your looking at a serious site investment, why not do that? I'd be logging SQM readings as well.