[Antennas] Using GeoClock To Find True North

[Chris BONDE]

Fortunaely, I have a lot plan for my lot and house.  Most municipalities 
require sucvh for building, ask them for a copy of yours.  It will help in 
other things as well, easements, actual lines.

Fortunately for me the street line is due N-S, and the North line is due E-W.

Simple
Chris opr VE7HCB



At 04:44 PM 2002-02-18 -0500, Charles Greene wrote:
>At 12:39 PM 2/18/2002 -0500, Merv Stump wrote:
>
>Merv,
>
>If you are in the Northern hemisphere, use the North star.  I line some 
>local landmark up with it, then use the local land mark during the 
>day.  If you actually want to use the sun, there are some nautical 
>almanacs that give you the time of local apparent noon depending upon what 
>your longitude is and what day it is.  Local apparent noon is when the sun 
>is crossing your longitude line and is directly South.  Another way is 
>that if you have a sextant or other means of measuring the sun's altitude, 
>it is highest at local apparent noon.
>
>>The ARRL Antenna Book describes a method for finding true north based on the
>>fact that the sun is directly south at 12:00 noon local time.  This is of
>>course only true if your qth is exactly on the longitudinal meridian on
>>which your time zone is based (e.g. 75 degrees for EST); and on the dates of
>>the summer and winter solstice.  For any other location and on any other
>>dates, corrections have to be applied to determine the exact time at which
>>the sun is in the south.  The antenna book explains how to make these
>>corrections.  However, I just noticed that GeoClock gives you the azimuth
>>and elevation angles for the sun at all times.  When the azimuth angle is
>>180 degrees, the sun is in the south.  Today at 12:08:40 I ran to see if my
>>boom lined up with the shadow of my tower.  It's a little off, and now I'll
>>have to worry about it until spring.
>>
>>Regards, Merv
>
>73, Chas, W1CG
>
>
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