[AZ-Observing] Re: Mars-Moon Conjunction - Now Pickering Scale

Bill Wood wrote:

> refractor.  The smaller the scope and/or shorter the f/l, the better the
> seeing looks.  I don't know whether aperture or focal length is the more
> important factor.


Definitely aperture.  The larger scope produces a smaller disc, which is
more sensitive to seeing.  This aperture dependence is the problem with
the Pickering scale, even though it works well for a given aperture.

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