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    Sextant scope out of collimation
    From: Federico Rossi
    Date: 2011 Mar 13, 22:41 +0100

    Hi,
    I routinely take sun and star sights ashore and keep a record of them: 
    usually my LOPs lie within 1-1.5 miles from my GPS position.
    Last week I took some star sights with my 1940 Plath sextant and found 
    all of them where off by about 5-5.5 miles even if observing conditions 
    were definitely ideal.
    While looking at my sextant with more attention I discovered that the 
    scope is out of collimation by about 4.5�.
    Can this misalignement account for the observing errors? In your 
    opinion, how much a scope being out of collimation can add to observing 
    errors?
    Federico
    
    
    
    

       
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