[Antennas] Finding True North (simplest method)

Thu, 21 Feb 2002 19:49:41 -0500

But ... Polaris will have a much larger error in only 10,000 more years
<grin>

Don Havlicek wrote:
> 
> Mike,
> Quite a novel approach, but not exact, as the precession of the earth
> makes the times pre-meridian crossing and post-meridian crossing
> unequal.
> I'm sure it would work within 1 or 2 degrees, so go for it!
> I'll stick with Polaris .. it's within .5 degree for all of North
> America.
> 
> Don
> N8DE
> 
> Mike J Maloney wrote:
> >
> > Of all the recent threads I read on the subject recently, I did not see
> > the method I use, which is quite simple.   Obtain the sunrise/sunset
> > times from the newspaper, radio/tv weather reports, or even Geoclock for
> > the day you want to check true north.  1.  Convert the sunset time to
> > 24hr format by adding 12 hours.    2. Add the sunrise and sunset times. ,
> > 3. Divide by 2 to obtain the time of your local meridan crossing.    The
> > sun is at its highest point and cast a true north shadow at this time.
> > If the total hours are an odd number such as 25,  subtract 1 hr and add
> > 60 mins to mins side.  If total hours are odd and minutes total more than
> > 60, subtract 60 and add 1 to hours side.
> > - - -
> >
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> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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