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    Re: Stellarium, refraction, HP
    From: Jim Rives
    Date: 2020 Jan 10, 17:20 -0800

    Hi Ed, 

    Here's an excel sheet with the data I have been using.  And a picture of the graph I did before running the regression in excel.  I wanted to see whether the line I drew on the chart would be considered a good fit.  I got the same exact LDobs at 18:00:00 using both methods, as Frank was confident I would.  

    Frank, I knew the Lunar was going to solve for GMT, not local time.  But I was under the impression that knowing GMT and Local Apparent Time (from shooting a noon sight, for instance) I'd be able to find local time... correct?  

    Anyway... my confusion about Stellarium's altitude was resolved... it is to the center of the body.  I am entering the refraction tables in the Almanac with the Stellarium altitudes for each body at 18:00:00, with the atmosphere on, and not adjusting for SD.  

    Let me know if you have any questions.  I am probably going on the slowest clearing of a Lunar ever.  I'm saving Frank's web-based solution as a final check of my answer. 


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