Re: [Paddlewise] Longitude and astronomy

From: Mark Perkins <marker_at_gmail.com>
Date: Thu, 29 Jul 2010 10:43:04 -0700
> How would you know,
> absent some geographical reference, whether you were observing high noon in
> Boise, Idaho or high noon in Perth, Australia?
>

During most times of the year, the altitude of the sun at high noon would
give a good clue, especially during the Perthian summer when there is up to
about a 60 degree difference in the sun's noon altitude. Assuming one knows
what time of year it is.

The tricky times are early April and early September when the noon altitudes
are similar (between Perth and Boise).

And, as others have pointed out, the position of the moon also gives a clue.

Thanks,
Mark
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Received on Thu Jul 29 2010 - 13:32:35 PDT

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