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    Re: Lunars.
    From: Steven Wepster
    Date: 2001 Jul 04, 8:27 AM

     Nigel wrote:
    
    > Thank you for your note Steven,
    >
    > The purpose of going on the nav group was to see if anyone had come up with
    > a different way of tackling the problem which is why it was rather broadly
    > stated..
    >
    > The point of my exercise was to explore the feasibility of establishing
    > longitude from a cleared LD other than using tabulated LD's from the
    > Almanac (which of course are no longer tabulated). I have tried calculating
    > HA moon from dec.star, assumed dec. moon and LD but of course end up with
    > some tedious iterations and doubtful accuracies.
    
    I don't get the point. Also, I don't understand how you compute the Moon's
    Altitude without putting your zenith/horizon reference system into the
    equation.
    >
    > Regarding watches, calcs etc, my own view is that if one wishes to use such
    > exercises as LD's then they should be done by hand with logs of the time,
    > usually Norie's 1805 edition (I do have earlier tables but they are a bit
    > fragile)
    
    Yep. I saw what I did as a first experiment. One of the major difficulties is
    getting an accurate measurement. It's relatively easy to bring a body down on
    the horizon, but it's something completely different to bring it diagonally to
    the moon. I didn't want to pre-set the sextant to the approx. right angle
    because that is a _serious_ form of cheating, in my opinion. You need to know
    Greenwich Time it.
    

       
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