[TowerTalk] FW: Finding True North Using the Moon
REHill at ix.netcom.com
Sun Aug 27 15:53:01 EDT 2006
Why use the moon and a clock? Polaris, the north star or pole star should
be an accurate beam pointing tool, and no other tools or calculations are
needed. What accuracy is needed? I'm guessing +/- 5 degrees is not bad,
with +/- 2-3 degrees is probably good given effects of wind, temperature
effects and such.
At present, Polaris rotates around the true north axis within 0.7 degrees of
the axis (1.4 degree diameter circle). It will become more accurate in the
future, getting within 1/2 degree in the year 2100. I suspect that is
within beam pointing accuracy? Good hand held magnetic compass accuracy is
at or greater than 1 degree, often 2 or more degrees inaccurate.
I'm guessing one could point the beam boom at the pole star and have an
acceptably close north pointing beam (well, from the northern
hemisphere...this won't work so well in Oz <grin>). I suspect lining up the
boom with Polaris would be as or more accurate than finding a land based
reference and looking up to align your beam.
Motherlode DX and Contest Club.
Number One in CQP
CU in the California QSO Party (CQP)
www.cqp.org, Oct 7-8 2006
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]On Behalf Of W3YY
Sent: Sunday, August 27, 2006 6:12 AM
To: TOWERTALK at contesting.com
Subject: [TowerTalk] Finding True North Using the Moon
The recent thread about magnetic north prompted me to offer the following.
Click here http://www.w3yy.com/truenorth.htm to see a method for using the
moon to determine true north. Hope you find it useful
73, Bob - W3YY
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