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Bill you wrote:
"Observation   Error
#1            -0.2'
#2            -0.1'
#3            -0.1'
#4            -0.2'

#1 and #2 with neutral-density shade over moon and light green over  Venus:
#3 and #4 with neutral-density and light-green shade over moon and  light
green over Venus.
I was pretty pleased, but then the separation was  only in the upper 15d
range, so relatively easy.  I was somewhat  surprised all were under."

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.

-FER
42.0N 87.7W, or 41.4N  72.1W.
www.HistoricalAtlas.com/lunars

   

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