[amsat-bb] Re: Azimuth question
lihan161051 at sbcglobal.net
Sat Jan 9 11:52:01 PST 2010
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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