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    Re: Possible limitaion for distance measurement
    From: Herbert Prinz
    Date: 2009 Mar 11, 17:30 -0400

    Hello George,
    
    The sole subject of Bremiker's article that I cited is the numerical
    accuracy of a given algorithm in a specific implementation (such as,
    say, a work sheet for Dunthorne's formula, broken down into such and
    such terms, evaluated by, say, 5 place logarithmic tables). In other
    words, if D, H, h, H' and h' are given, he asks about the potential
    numerical error in D' that is inherent in a given numerical procedure.
    This question is different from the one that investigates how D' depends
    analytically on D, H, h, etc. Should one find that under certain
    circumstances D could be nearly the same for substantially different D'
    (so that it becomes hard to derive  D' from D), this would affect all
    numerical methods equally, because the limitations stem primarily from
    the measurement of D.
    
    Herbert Prinz
    
    
    George Huxtable wrote:
    
    >[...] If Herbert is discovering, in Bremiker's work, worst-case examples in which
    >the precision of a lunar distance is only half of what you might otherwise
    >expect, keep an open mind; Bremiker might be including the effects of
    >parallactic retardation.
    >
    >
    >
    
    
    
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