[time-nuts] Crude Survey Technique

J. Forster jfor at quikus.com
Thu Nov 21 23:34:47 UTC 2013


As I said before, the RA and Dec of Polaris is well known.

Spherical trig and the Siderial Time will give you the offset from the
true pole in Az and El.

With corrections for refraction, this is good to better than an arc-second.

-John

==============




> On Thu, Nov 21, 2013 at 12:45 PM,  <TMiller at skylinenet.net> wrote:
>> If you want true north, set up a camera that has time or bulb shutter at
>> the south end of your property. Put in a marker stake. take a time
>> exposure at night with the camera facing north. If you expose for about
>> 30 minutes, you will get a landscape with the stars rotating around the
>> north star. You can then mark the north location on your property under
>> the north star.
>
> I vote this suggestion as the winner.  The north ster is offset a
> little from the pole but if will make an arc like the others and you
> can find it's center.  This method could get you to better than a
> degree..
> --
>
> Chris Albertson
> Redondo Beach, California
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