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It is misleading, surely to talk about horizontal gnomons on roman
Berossus-type dials. The only purpos of the metal 'gnomon' is to provide a
support for the nodus tip, which is the only part of the 'gnomon' that it used
for telling the time and/or date on these dials. The support could come in
from any angle - even by convoluted/spiral/twisted or whatever so long as there
was a point acting as a nodus at the 'centre' of the dial to cast the
shadow correctly.
David Brown
Somerset
UK
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