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    Re: Francis Upchurch's Astra sextant...and my first lunar!
    From: Modris Fersters
    Date: 2023 Feb 9, 01:07 -0800

    Hello, Jonathan!

    I would like to ask some questions about your first lunars. Did you took 2 independent lunar sights or maybe your published Mars and Jupiter lunars each represent a set of several avaraged observations?

    You have one excelent result and one quite bad result. It would be interesting to find out why the Jupiter's lunar has so large error. Have you any idea? How powerful telescope did you use?  Did you use light shades for Jupiter (I typically use it  because it is then much easier to identify the center of the Jupiter's circle)?

    About Frank's lunar calculator: if you use calculated altitudes for your observation place, there is no need to fill in your height of eye. This field is used when you use measured altitudes. Just make an experiment: type random value of height of eye, and you will see that the error in lunar does not change.

    Modris Fersters

       
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