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    Re: Lewis and Clark. was: sextant practice and time keepers
    From: Ken Muldrew
    Date: 2010 Sep 21, 10:55 -0600

    On 21 Sep 2010 at 9:30, Antoine Couette wrote:
    
    > For the Lunar distance observations, night of 2-3 Dec, 1803, you
    > indicated :
    >
    > "Those confusions relate to ordinary altitude observations, but things
    > get
    > much worse when we reach the attempts at a lunar, at Kaskaskia, on the
    > night of 2-3 December, 1803. Try as I might, I am quite unable to unravel
    > the observations to make sense of them. If anyone else can arrive at any
    > understanding, I would be most pleased to hear about it. Details are all
    > there on the website, if you follow the journey to that date."
    >
    > I wish to give it a try : what observer's coordinates should I (best) use
    > to re-work these Lunars ?
    
    We had a go at those bizarre lunars once before on Navlist. Once you have
    had some fun with them, it might be amusing to see previous speculation on
    these incomprehensible data.
    
    http://www.fer3.com/arc/sort2.aspx?y=200404
    
    I was convinced that they were reading off the wrong side of the nonius.
    If you work the aldebaran lunars with an offset of 15�15', then they work
    out rather well but the intervening Regulus lunar has a different offset.
    So unless they used two different instruments for the different stars, or
    two different individuals made the observations, it remains a mystery.
    Whatever else you get from trying to figure out these data, you will be
    quite convinced that the instruction that L & C received in celnav was too
    brief.
    
    Ken Muldrew.
    
    
    
    

       
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