[TowerTalk] Finding lat/lon, direction, distance, magnetic declination

[LYN Williams]

For those who haven't yet found these resources, you can use the
following sites to determine your own (or someone else's) lat/lon
coordinates, the distance and direction from most any place to most
any other place, and the difference between true North and what your
accurate compass shows.

To determine lat/lon in the US try:
http://www.juggling.org/bin/un.cgi/map-find


To determine distance and direction in the world try:
http://indo.com/distance/

To determine difference between true North and what an accurate
compass indicates, try:
http://www.geolab.nrcan.gc.ca/geomag/e_cgrf.html

Hope this is useful to someone.

Lyn, W4WDN

Guy Olinger, K2AV wrote:
> 
> The necessity with using shadows to grab north is the calculation of
> *True Solar Noon* for one's particular position on a given day. Have at
> look at the web page http://aa.usno.navy.mil/AA/ which will print out
> the solar angles for a particular day for a particular position, in 1
> minute intervals if you wish.
> 
> This is needed because the earth's orbit is not circular and the degrees
> swept in the heavens by the earth's position as seen from the sun vary
> according to the earth's velocity in it's orbit, which is greater when
> nearest the sun and slowest when farthest.
> 
> So not only does "noon" vary by longitude, but also by subtle
> particulars of the earth's orbit.  The printout from US Naval Astro
> Applications calculates all that and gives you a time which also avoids
> problems with various definitions of "sunrise" and "sunset".
>

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