There is an interesting difference in the construction of a sundial and an astronomical clock. On a sundial, you can change the solar time indication to a time zone indication. This is not my preference. But you can do it. If the sundial also has lines for unequal hours or Italian or Babylonian hour lines, they should not be changed.
That is different on an astronomical clock. This produced an annoying blunder on the famous astronomical clock in Prague. To please the tourists who assemble there, the clock indicates now Central European Time rather than solar time as it once was, The indication of unequal hours and Bohemian (Italian) hours now gains about a quarter in February and loses a quarter in the period of end October and begin November. On this once so accurately crafted clock ! The tourists don't worry about it. Most of them are only interested in the puppet show of the apostles in the hourly opened shutters. See more on the Prague clock on my website at http://www.wijzerweb.be/prague.html Willy Leenders Hasselt in Flanders (Belgium) Visit my website about the sundials in the province of Limburg (Flanders) with a section 'worth knowing about sundials' (mostly in Dutch): http://www.wijzerweb.be
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