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    Re: Lunars and the Astra IIIb
    From: Eric Haberfellner
    Date: 2001 Dec 16, 10:52 AM

    I ordered the book on lunars from Celestaire.
    
    -----Original Message-----
    From  John Kabel [mailto:jjkabel{at}rogers.com]
    Sent: Sunday, December 16, 2001 11:10 AM
    To: ehaberfe{at}ROGERS.COM
    Subject: Re: Lunars and the Astra IIIb
    
    
    On 15 Dec 2001 at 19:37, Eric Haberfellner wrote:
    
    > I have acquired a copy of Bruce Stark's "Tables for Clearing the Lunar
    > Distance and Finding G.M.T. by Sextant Observation"...
    --
    snip
    --
    > Eric Haberfellner
    
    John Kabel replies:
    
    The Astra IIIB is an excellent sextant for this work.  The errors are
    more likely to be due to motion of the deck.  If you try lunars from
    the beach, you should get very small errors.  I have an Astra that
    had no index error for the dirst year that I owned it.
    
    Prudent navigators will know that sextant navigation has a large
    error circle when compared with GPS.  This is likely to reopen a
    debate about errors on this list.  I recall that we at one time had a
    thread, in which error circles of three to ten nautical miles were
    discussed.
    
    Where did you acquire the book on lunars?
    
    John Kabel
    43 N 81W
    

       
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