My feeling is that the simpler you make the dial, the more likely it is to be
used/understood. So.....make a dial with only one scale of hours, arranged to
show local time i.e. noon line vertical, and noon (preferably) or 1pm marked
on that vertical line. then in the equation of time correction curve, allow
for longitude in the scale of minutes correction (the curve is 'lifted' on
the minutes axis by 4minutes for everey degree west of the time zone standard
meridian, and lowered correspondinglyfor every degree east. Then put a short
instruction clearly on the area of the correction curve that says (if in UK,
for example, for a dial that has 12 marked on the local noon line) GMT: apply
minutes. BST: + 1 hr.
David Brown, Somerton, Somerset, UK
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