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    Re: Planet rising revisited
    From: Lars Tornqvist
    Date: 2002 Feb 5, 22:55 -0000

    Hi Dave
    
    All objects at their rising position are farest away (90deg or 5400 Nm
    away) - meaning it's perfect for an azimut! Azimuts are used for compas
    corrections.
    You don't need the exact time for an exact azimut - and furthermore your own
    position does not need to be exactly to obtain a good azimuth!
    
    Two Objects which is 5400 miles away will have the same bearing within a
    broard margin of position
    
    Imagine that you are in London and could see the Statue of Liberty in N.Y
    If you take a bearing of the Statue and walk south 5 miles the bearing will
    still be the same or impossible to detect by your compas!
    
    Nowadays we take azimuts with high precisions due to precise clocks and
    knowledge positions etc.
    The rise of an object in the old days was very important as the knowledge of
    magnetic variation was poor or none - an azimut as often as possible was
    certainly a great need those days!
    
    Hope this will do.
    
    Lars
    
    
    ----- Original Message -----
    From: daveweilacher---.net 
    To: 
    Sent: Tuesday, February 05, 2002 10:19 PM
    Subject: Planet rising revisited
    
    
    > What practical use would a navigator have for determining when a planet
    would rise?  (other than at twilight)
    >
    > Dave
    >
    >
    >
    > --------------------------------------------------------------------
    > mail2web - Check your email from the web at
    > http://mail2web.com/ .
    
    
    

       
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