Hi Tony et al, Congratulations on getting a commission for a dial so far north - I am sure we will all be fascinated to see such an unusual dial when it is completed.
With regard to the "midnight gap" in the timescale, I can say that the term "gnomon gap" will appear in the next edition of the BSS Glossary. The term really covers the case of vertical decliners with thick solid gnomons, where the gap is on the sub-style line. But I think it covers the present case too! Regards, John ----------------------------------- > from: [EMAIL PROTECTED] > date: Wed, 18 Jun 2003 17:46:23 > to: sundial@rrz.uni-koeln.de, [EMAIL PROTECTED] > subject: Re: [britishsundialsociety] A new term for The Glossary? > > Fellow Shadow Watchers, > Most diallists are familiar with the Noon Gap that > occurs on a horizontal sundial with a thick style edge. The fact that the > shadow 'swaps edges' at 6.0am and 6.0pm is also well understood. > > I'm currently designing a large horizontal sundial for Longyearbyen at 78° > 12' north to be located on Spitsbergen in the Svalbard Island Group, where it > may well be 'the world's first heated sundial', permafrost and cabling > permitting. > > The sun at 78°N is above the horizon for several months continuously so the > dial must read for a full 24 hours and its only just now dawned on me that > the corollary of a 'Noon Gap' is a 'Midnight Overlap'. i.e. With a style > edge of any significant thickness the half hours-ish either side of midnight > occupy the same space on a 24 hour dial. Of course a similar situation > occurs with an 'overhung' gnomon at Noon at lower latitudes as has been > discussed on the SML before so I should have anticipated this. > > Is this a new term for The Glossary or too rare to be worth listing? ;-) > > Tony Moss > > > ------------------------ Yahoo! Groups Sponsor ---------------------~--> > Get A Free Psychic Reading! Your Online Answer To Life's Important Questions. > http://us.click.yahoo.com/Lj3uPC/Me7FAA/ySSFAA/PMYolB/TM > ---------------------------------------------------------------------~-> > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > Dr J R Davis Flowton Dials N52d 08m: E1d 05m -
