I was thinking that any discrepancy could also be attributed to what kind of stuff - smoke, smog, pollution is in the atmosphere at the time. Would this effect the apparent position of the sun than if one was looking through clear atmosphere?

I also believe there is an ability in Guide to do user specific horizons... I think there was a thread way back that mentioned this, maybe not as my memory is hazy :>

James

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At 07:43 AM 27/04/01 +0200, you wrote:

 
> Last night, at my observation site, I was checking the sun set at the
> time that GUIDE show me in Quick Info. Even if I had enter the exact
> location, there was a small but significant discrepancy, in term of
> few minutes, between what I observe and the time calculated by GUIDE
> Quick Info. I thing that there is two main reasons for such
> discrepancy.