Hi Alison,
Executive summary: Mr. Phillips can't have it.
More detail:
the central scale of dates is a projection of the direction of the
Earth's axis. This fixes the direction of the date scale on a
horizontal dial to point along North-South. Nothing can be done about
it (other than tilting the planet differently :-)
Also, he can have a circular (non-elliptical) dial only if:
- either the gnomon is non-vertical; since the gnomon must be
vertical (a person standing up), this is also out of question,
- or the dial plane is not horizontal. This may be more
reasonable, depending on the physical layout of the area.
--
Jan Bielawski
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