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    Re: Instumental error?
    From: Alexandre Eremenko
    Date: 2005 Apr 20, 11:21 -0500

    > > I know a very clever method of calibrating your sextant
    > > "at home" that is without stars, but you need a theodolite
    > > or another instrument more precise than the sextant,
    > > and with precise level.
    > > Can describe the method to the list if anyone is interested.
    > > (I recently read about it in one XIX century paper on
    > > the Internet).
    > Please do publish.
    > Bill
    
    The article is available on:
    http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=
    1865MNRAS..25...56T&db_key=AST
    but I am not sure whether it's free or Purdue pays for
    subscription.
    
    But I am afraid that my conclusion that it is a clever method
    was somewhat premature:-)
    Trying to describe it with my own words I found that it is
    hardly practiceable with the sort of ordinary theodolites
    I've ever seen:-) A theodolite with hudge objective lens
    is needed...
    
    Alex.
    
    
    

       
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