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--- Begin Message ---Sent from my mobile. -------- Original message --------From: Dennis Cowan <dennis.co...@btinternet.com> Date: 12/07/2018 21:50 (GMT+00:00) To: 'Steve Lelievre' <steve.lelievre.can...@gmail.com> Subject: RE: Eshaness Lighthouse Sundial, Shetland The sundial was placed by the Northern Lighthouse Board, who are responsible for all Scottish lighthouses, but all the lighthouse dials were removed when the lighthouses were automated leaving only the columns in place. The sundials were then sold off. The Eshaness lighthouse was subsequently sold to a private buyer who replaced the sundial. The current sundial is therefore not original. Most well-made Scottish horizontal sundials range from 4am to 8pm, but in this instance probably a lack of knowledge resulted in the sundial that is currently in place. Dennis Cowanwww.sundialsofscotland.co.uk Facebook – Sundials of Scotland From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Steve Lelievre Sent: 12 July 2018 20:56 To: Sundial List <sundial@uni-koeln.de> Subject: Eshaness Lighthouse Sundial, Shetland My recent visit to Shetland took in the recent summer solstice, allowing me to experience for myself how Shetland's summertime sunsets are very late and sunrises are corresponding early. Daylength at the solstice was around 19 hours, with (civil) twilight taking up another 3½ hours or so.Here is a photo I took of a sundial at the Eshaness Lighthouse (60.489314°N 1.627209°W). Unfortunately it's on private property, so I couldn't get close enough to read the the little plaque. The current lighthouse was completed in 1929 so I guess the dial may be that early too.In Shetland the sun doesn't go anywhere near the zenith even at midsummer so I was surprised by the height of the gnomon. It's just asking to be dinged, but Shetlanders are good and gentle folk so there no sign of vandalism; just a bit of rust and corrosion. I wonder why the dial spans only 12 hours? I have seen a number of other dials that only cover 12 hours but I've never really questioned that attribute before. Of course in this case they've stuck the dial where the nearly building obscures the sun late in the day, so evening hours don't really matter. That aside, surely we should expect a dial made for such a northerly location to reflect the extreme summer daylengths? There is plenty of open space nearby where the dial could have been sited to accept sunlight throughout the summer evenings.To me it seems a trivial matter to design a dial that covers the full midsummer daylength. Can anyone justify, or at least explain, the 12 hour limit? Steve
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