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Thanks for that Frank. That is most useful.

It will be interesting to plot Ho error against Hc for my sightings when I
get back and see if any significant anomalous dispersion comes out of the data.

Geoffrey Kolbe


>Here's a refraction table prepared for ocean conditions for every half
>degree of altitude from 0 to 5 degrees above the  horizon:
>33.8'
>28.3
>24.1
>20.8
>18.2
>16.1
>14.3
>12.9
>11.7
>10.7
>9.8
>And  here's a similar refraction table for desert  conditions:
>32.4'
>27.5
>23.6
>20.5
>18.0
>15.9
>14.3
>12.9
>11.7
>10.7
>9.8
>As  you can see, they match for altitudes of 3 degrees and higher. Both
>tables are  for standard temperature and pressure at sea level so you
>still would
>need to  apply corrections for non-standard T and P and for altitude above sea
>level.
>
>Of course, tables like these are only right when the actual conditions  match
>the input conditions. It's easy to imagine conditions in the desert, for
>example, right after sunrise, when the temperature distribution would not
>match
>the assumptions above at all.
>
>-FER
>42.0N 87.7W, or 41.4N  72.1W.
>www.HistoricalAtlas.com/lunars

   

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