[amsat-bb] Re: Azimuth question
Doug Faunt N6TQS +1-510-655-8604
faunt at panix.com
Sat Jan 9 13:08:42 PST 2010
BTW, even Polaris isn't a perfect indicator of true north. It's up to
2 degrees off for latitudes from the equator to 60 degrees north, and
you can read the nearby constellations to see when it's right on.
Consult Bowditch if you really care.
From: Bruce Bostwick <lihan161051 at sbcglobal.net>
Date: Sat, 9 Jan 2010 13:52:01 -0600
On Jan 9, 2010, at 1:47 PM, Dave Guimont wrote:
> At 11:37 AM 1/9/2010, you wrote:
>> True North is used as a reference. Magnetic North changes with
>> location and time.
> Art, what does mag north have to do with time??
Magnetic deviation changes slowly over time as the earth's magnetic
field changes. The rate and current deviation are usually pretty
precisely known for most areas.
"No nation was ever so virtuous as each believes itself, and none was
ever so wicked as each believes the other." -- Bertrand Russell
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