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> I don't think you should worry too much about  this (that they were all
> "under"). These are excellent results, and the fact  that they are all
> negative
> values probably means nothing. Considering the  weather at the time of those
> sights and the low altitude of Venus, you might  want to experiment with
> varying
> the temperature during the clearing process to  see how much that will
> influence the cleared distance. The air has been very  thick in the Midwest US
> recently! High barometric pressure and Siberian cold  guarantees a significant
> increase in atmospheric density and therefore  refraction.

Frank

I did note temperature and barometric pressure at the time and corrected the
BP to 700ft. I did not try changing temperatures but will do.  I did occur
to me with Venus relatively low in the sky and high PB refraction could be
playing with me.

Thanks

Bill

   

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