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    Re: Was this optical instrument designed for celestial navigation?
    From: John Morris
    Date: 2016 Feb 3, 09:22 -0800

    David, thanks.  I did celestial nav when I was X0/navigator of a USN ship, and got very tight 3, 4, or 5-star fixes.  I avoided planets because additional corrections were needed.  We were never taught about horizon dip.  Do you think that parameter was already figured into our nautical almanac, or is that figure one that can only be obtained locally at time of star observations?

       
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