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Article #6299

Re: timepieces

#6299
From: Nigel Haslock
Date: Tue, 12 Jan 1993 23:33
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Since this thread is not quite dead yet, I will add a couple of observations.

A number of posters seem to have forgotten (or simply not been aware) that the
point on the horizon that the sun rises moves with the season. The worst case
for this is those lands north of the arctic circle where the sun goes from
never rising to never setting (within a 24 hour period). Thus a useful sundial
must be adjusted from day to day.

None of the fixed sundials that I saw in Europe were obviously adjustable but,
at the time I saw them, I was not interested in how accurately they measured
time. Thus I did not look for possible adjustments.

On the other hand, every reproduction portable sundial that I have seen has
included adjustments for the time of year. The one the I remember best had
a separate setting for each month of the year and two hour marks allowing
determination of the third, sixth and ninth hour of daylight.

	Fiacha
	Aquaterra, AnTir
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References: <9301111928.AA11794@math.bu.edu>

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From: haslock@rust.zso.dec.com (Nigel Haslock)
Newsgroups: rec.org.sca
Subject: Re: timepieces
Date: 12 Jan 1993 23:33:13 GMT
Organization: Digital Equipment Corporation - DECwest Engineering
Lines: 19
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