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Hello Brian
you wrote:
Have you considered offering a split analemma dial - with one analemma for
morning and one for afternoon? Mean time can be directly read with an average
accuracy of around 30 seconds all round the dial and the EoT graph can be
discarded!
Are you referring to a polar dial, a horizontal dial or both? I am aware of
split analemmas on dial faces that allow one to tell Standard Time
directly. I used to call these "Singleton" dials. (I'll send
you off list a drawing of one). But these dials don't have separate split
analemmas for am & pm. So I'm confused about what you mean. Would you
know where we can see picture of one like you describe?
By the way, Mike Shaw commented that the winter and
summer numbering might be wrong on my polar sundial PDF face drawing
at http://www.sundialsculptures.com/pdf/polar_sundial_functions.pdf
Well, yes and no! This particular polar face drawing is of a sundial
here in Tucson where we do not have Daylight Saving Time, so both the summer and
winter time scales are the same. But I will change this drawing to a face
that shows the one hour difference to avoid confusion. Thanks Mike. But
even on a polar sundial that is in a place where there is no Daylight
Saving Time, you must have separate winter and summer time scales because
if the gnomon is not very long, its shadow only crosses one time scale in the
middle of winter and summer.
Thanks Brian
John
John L. Carmichael Jr.
Sundial Sculptures 925 E. Foothills Dr. Tucson Arizona 85718 USA
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