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    Re: 3 fix celestial problems
    From: Millard Kirk
    Date: 1997 Sep 03, 9:29 PM

    Russell Sher wrote:
    >
    > Hi - I am intrigued by the 3 fix celestial problems where the DR is not 
    given (to make things interesting) and the observer could be anywhere on the 
    terrestial sphere - I would like to ask the following:
    >
    > 1. What does one use for the initial DR guess? (you have to start somewhere 
    !) - does one just guess and then recalculate once the (huge) intercept is 
    obtained so as to make the intercept zero (by moving along the intercept) and 
    then use the newly obtained DR as the DR for the remaining sights?
    > 2. Has anyone plotted large intercepts  on  a large enough scale plotting 
    sheet and obtained the fix this way? without recalculating
    > 3. Is there a better method than just guessing initially?
    > 4. I would be interested if anyone would like to discuss their method of reducing these sights
    > ALSO -  check out:  http://users.aol.com/promarsoft/navsite/map.htm
    > for the beta version of skymate software
    > Cheers
    > Russell
    
    Dave Weilacher <0002125481{at}mcimail.com> Ask that three sun sights be
    posted so that those interested could try and find the position.. I
    posted three sun sights and one moon sight.  I did not give the  DR or
    ZN but did indicated if the DR  was needed it could be found by using my
    address in the signature of the post.
    
    Whether or not the position could be found without a DR I do not know
    and also would be interested in knowing.
    
    A couple of questions comes to mind:  If one knew the ZN could they find
    the position without a DR, and if one was place somewhere in the middle
    of a ocean  not knowing their DR could they find where they were by
    shooting three stars, sun, moon or planets.  Using computers,
    calculators, ets..  No GPS or LORANS Please.
    
    Note: Lieberman  Millard,I think you are at 38d
    24.3'N, 82d 17.9'W (a long way from the> briney blue!) Well that is
    about as close as I get when I calculate the sight. Well... maybe a
    little closer. Lieberman results are closer to the GP than what I
    calculate.  Good job Lieberman.
    
    Original sights plus ZN and DR  38d N 82d W
    
                    Sun             Sun             Sun             Moon
    GMT(Date)   8 Oct 1996      14 Oct 1996      29 Oct 1996    25 Oct 1996
    GMT         18:54:33        16:39:44         14:58:58       02:11:21
    Hs (LL)     39d 41.1'       42d 12.1'        28d 59.1'      47d 03.2'
    IC              0               0               0               0
    Dip             0               0               0               0
    ZN             213             168             142             137
    
    All shots where taken using the ASTRA IIIB and an artificial horizon.
    No IC and no Dip. The lower limb of the bodies where used.  From my
    address below you should get an assumed position or DR. The house is not
    moving now, well it used to move a lot before got proficient with the
    sextant.
    
    Learning the Hard Way!!
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     Millard Kirk KB8YQO 	Email - mkirk{at}marshall.edu
     116 Lewis Ave	     	Homepage- http://webpages.marshall.edu/~mkirk/
     Barboursville, WV      A West Virginia Blue Water Sailor
     25504                  (304) 736-6544
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
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