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Article #6299Re: timepieces
From: Nigel Haslock
Date: Tue, 12 Jan 1993 23:33
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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arc1-ca.pugleaf.net!sparky!uunet!usc!elroy.jpl.nasa.gov!ames!sun-barr!decwrl!deccrl!news.crl.dec.com!pa.dec.com!rust.zso.dec.com!haslockReferences:
<9301111928.AA11794@math.bu.edu>Show Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!usc!elroy.jpl.nasa.gov!ames!sun-barr!decwrl!deccrl!news.crl.dec.com!pa.dec.com!rust.zso.dec.com!haslock 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 Message-ID: <1ivkfpINN8vf@usenet.pa.dec.com> References: <9301111928.AA11794@math.bu.edu> NNTP-Posting-Host: rust.zso.dec.com