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    Stellarium, refraction, HP
    From: Jim Rives
    Date: 2020 Jan 9, 13:25 -0800

    I am trying to clear a series of 6 sun-moon lunars taken on 2 January.   I have a best fit straight line throught the data and came up with what I think is a pretty good regression (but really don't know how good is good enough). Average LD 56.05, R^2 = .987, StdDev 1.7.    In any case, I decided to pick a LD on that line coincident with a convenient time... exactly 1800z.  And, I went into Stellarium to get the altitudes I needed for that time of the sun and moon.  I read in a post on this subject back in June of last year that Stellarium builds in the refraction and weather related anomolies and those can be eliminated by switching the atmosphere off.  I couldn't find out if the altitude that stellarium provides is geocentric or topographic (or from the surface of the earth as I understand the term).   What I believe I need is to get the altitude with HP removed as well, as if at the center of the earth.  Does anyone know the Stellarium settings I would need to use to be sure of that?  

    Then, so armed, I'll be ready to see how I did determining the local time on Cape Ann on Jan 2!   


    Jim Rives

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