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    Re: Mars - Mercury Question
    From: Alexandre Eremenko
    Date: 2013 Feb 3, 13:08 -0500

    Don,
    
    > And the periods in which Mercury appears to be moving fastest across the
    > sky are when it is in conjunction, and thus not visible from Earth.
    
    Yes. Actually Mercury can be seen only if it is far from the Sun,
    and these are exactly the times when it almost does not move.
    
    This makes Mercury completely hopeless for determination of longitude.
    
    Alex.
    
    
    > Don Seltzer
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