[Top] [All Lists]

A matter of taste

To: <>
Subject: A matter of taste
From: (
Date: Wed, 08 Jan 1997 15:16:29 -0800
John Brosnahan wrote:
> >Ed,with respect, I have heard the term declination used all my
> >life by those that were in the profession of surveying, navigating,
> >etc.  I took the time to look it up in Webster's because I was
> >puzzled by your (and others) statements that it was not correct.
> >Webster's says:
> >
> >"Angular distance north or south from the celestial equator measured
> >along a great circle passing through the celestial poles."
> >
> >Doesn't that accurately describe what has been talked about?
> (No, sorry, but then the deviation is not correct either.)
> That is not what is being talked about.  The use of declination in
> your case is for astronomical purposes--where the position of a
> star is defined in terms of declination and right ascension.
> This use of declination in the discussed case is for surveying
> and navigating and aligning Yagis on Heard Island and is
> referenced to the earth's magnetic field, and is the correct term.
> The MAGNETIC DECLINATION, called angle D, is the angle between
> Geographic North and Magnetic North.
> Maybe the flyboys use deviation but the CORRECT term
> (Physics and Surveying) IS declination.
> BTW  The MAGNETIC DIP or INCLINATION, which is the angle I,
> measured between the horizontal and the direction taken by a freely
> (3D) suspended magnetized needle.   At the magnetic N and S poles
> the dip is vertical (and at the magnetic equator it is horizontal).
> 73  John  W0UN
> ref.    Surveying  5th Ed.  Bouchard and Moffitt
>         Principles of Physical Geology 2nd Ed. Holmes
> John Brosnahan
> La Salle Research Corp.
> 24115 County Road 40
> La Salle, CO 80645 USA
> voice 970-284-6602
> fax   970-284-0979
> email
> --
> FAQ on WWW:     
> Submissions:    
> Administrative requests:
> Problems:       
> Sponsored by Akorn Access, Inc & KM9PWell, you physicists may like 
> declination, but us fly-boys prefer 
deviation.  There are more flyboys than physicists, I'd wager.  "It's all 
a matter of taste," he said, as he kissed the cow.



FAQ on WWW:     
Administrative requests:
Sponsored by Akorn Access, Inc & KM9P

<Prev in Thread] Current Thread [Next in Thread>