In the UK, daylight saving runs for 7 months during the Summer Time, end of March to end of October, so I favour making dials which show daylight saving on the grounds that:- a) it is correct for the majority of the year b) summer is when the sun (occasionally) shines
But I have two dials that adjust for the one hour difference:- 1) A polar dial with a pointer (nodus) perpendicular to the dial plate. It shows declination lines for my family's birthdays, but the vertical hour lines are marked with daylight saving time at the bottom (sun high), and normal time at the top (sun low). So you look at the time nearest to where the tip of the shadow falls. 2) An equatorial dial made from a cylindrical pipe, cut so that it stands at an angle equal to the latitude. The hour lines are marked on the inside of the pipe, on the equatorial plane It has two gnomons cut out on the circumference. The upper one's shadow cuts the hour markings in the summer when the sun is above the equatorial plane, the lower one's shadow cuts it in the winter. The gnomons are offset by one hour. As the angle subtended from the centre of a circle is twice the angle subtended from the circumference, you can't show as many hours as when the gnomon is at the centre, but I have made a prototype with four of these stuck together to show the full 24 hours. Mike Shaw
