Bill Walton wrote:
To get the desired accuracy the pin-holes' themselves must be very
accurately aligned (not true if the free pin-hole technique is used and
the hole moved back and forth until the shadow of the gnomon is centered,
and on the hour mark, at the same time)
They would not have
Art, Daniel, Charles, and other Dialists,
I believe one could make a dial that could be read to a few seconds,
however I'm not sure of why one would want to be able to read a dial at any
time to this accuracy or precision. At most one might want such a dial to
be able to set a watch or clock,
Discussions here and experiments of my own have established that shadow
sharpener techniques allow a shadow position to be read with accuracy on
the order of one second of time. This led me to look for a configuration
that allows a continuous readout with this type of accuracy, not just the
