[TowerTalk] Positoners Calibration to True North

[Keith Dutson]

Using this method one can point their 30 degree aperture multi-element beam
with one degree accuracy. :)

73, Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of W0UN -- John
Brosnahan
Sent: Friday, December 02, 2005 10:40 AM
To: Tower Talk List
Subject: Re: [TowerTalk] Positoners Calibration to True North

Local Solar Noon

Go to your newspaper weather forecast column (or almanac section) and get
local sunrise and sunset times.

HALF WAY IN BETWEEN is local solar noon.


Or go to www.weather.com then type in your zip code and then click on
sunrise/sunset for your local sunrise and sunset times.

HALF WAY IN BETWEEN is local solar noon.


Or go to http://www.weatherunderground.com then type in your zip code and
then scroll down to the Astronomy section for sunrise and sunset times.

HALF WAY IN BETWEEN is local solar noon.


Plumb a stick and at the calculated time the shadow is true north.  With a
long enough stick and a bright sun you should be able to obtain true north
with greater than one degree accuracy.  This is about the same accuracy you
can obtain using Polaris (the North Star) without compensating for its
3/4 degree offset and subsequent rotation around the true north position.

--John  W0UN


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