That is pretty bold claim, one which I do not make with my own dials. This dial is designed to be readable to 5 seconds, but accuracy could be another matter. There are so many variables that affect accuracy, and some are easily overlooked. Specifically, critical alignment with the north celestial pole is extremely hard to achieve. A magnificently designed dial can perform only as well as its installation will allow. Accuracy related to alignment varies with time of day and the sun's declination; I have not done the math for a while, but I think even a misalignment by 1/10th of a degree an any direction will preclude accuracy of say, 15 seconds for a least part of the day, during some part of the year. Year-on-year variation in the EoT is another matter, but could be properly compensated if accounted for.
Claims of accuracy (for civil time) can be evaluated only by simultaneous measurements of dial and clock at different times of day, and different times of the year. Even a broken watch is accurate twice a day. -Bill On Sun, Apr 13, 2014 at 9:54 AM, cerculdestele . <cerculdest...@gmail.com>wrote: > Does anyone know if this record has been broken? > > > http://www.engadin.stmoritz.ch/sommer/en/activities/mountain-adventure/mountains/muottas-muragl-mountain-adventures/sundial-muottas-muragl/ > > Dan Uza > Romania > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > >
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