Dear Tony
Extreme latitudes are not extreme only when it comes to the climate and the
behavior of the sun. Using a compass to find geographical north at Longyearbyen
might be easier said than done. The alignment of the magnetic field at
Longyearbyen might vary during the day and from day to da
Dear Tony,
> As any diallist is painfully aware the most probable event for
> dial installation is an obscured sun all day...
Indeed so!
> ... we may be forced to do the diallistically unspeakable
> viz. a temporary magnetic alignment...
May I suggest that you equip yourself with a cheap handh
Here's the site I use for magnetic declination values:
http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl
Hope this helps,
Jim Tallman
www.artisanindustrials.com
[EMAIL PROTECTED]
-
Tony, what website do you use for magnetic variation? I ask because I need
to know the MV for Oxford. I'm going to take my compass so that I can get
wall declinations of SGS in Oxford.
Have fun installing your new dial. Hope you get some sun.
John
John L. Carmichael Jr.
925 E. Foothills Dr.
The DoD World Magnetic Model predicts for 1 March 2004 at the given location a
magnetic declination of 4.06 degrees (compass will theoretically point
4.06 degrees to the east of "true" north). A different magnetic model,
the International Geomganetic Reference Field, gives 4.22 degrees. Take
your
I am sure you are well aware of the duration of sunlight at that time of the
year at that location (assuming the sun peeks through the clouds) but just
for your convenience, here is a graph of it.
http://home.comcast.net/~houghbob/sundial/spitzbergen.pdf
Robert Hough
Shadow Master
32.37 N 113.13
Hi Anne,
>
>Extreme latitudes are not extreme only when it comes to the climate and
>the behavior of the sun. Using a compass to find geographical north at
>Longyearbyen might be easier said than done. The alignment of the magnetic
>field at Longyearbyen might vary during the day and from day t
Tony,
I well recall working in the Vestfold Hills (lat 68o S) in Antarctica where
the variation was 78oW. Took a long while to get used to this high value. Of
course, all we had to do was walk roughly in the right direction , give or
take 10o, and we always got to our destinations OK.
It's funny
Greg Milsom wrote:
>
> Is anyone aware of a shareware or freeware program available on the web
> that will compute the magnetic variation for various Longitude and
> Latitude coordinates? I am trying to orient my homemade dial and come up
> with slightly different variations depending on who I ta
The magnetic declination changes slowly with time. The Geological Survey of
Canada's on-line magnetic declination calculator gives for your coordinates:
1995 10d 11m W
1998 10d 22m W
2000 10d 30m W
You can get a DOS or Windows program for do-it-yourself use at
http://geomag.usgs.gov/
-- Richard
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