Re: [OM] more star trail Qs (re. speed, time, aperture)

[Chuck Norcutt]

John is correct.  For a more complete definition see:

http://www.celestron.com/tb-trms.htm

and for a more theoretical illustration see:

http://www.astronomics.com/Content/how_to_pick/terms.htm


"J. Williams" wrote:
> 
> Just to clarify a few things.  While stars are theoretical points of
> light when they pass through a lens/mirror they form a diffraction pattern
> (Airy disk).  The Airy disk is inversely related to aperture size. The
> bigger the objecti[ve] the smaller the pattern. So, a larger objective lets
> you resolve such things as binary stars.
>

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