Greetings, fellow dialists,
Thanks, all, for the communications. I think I did not make it clear
that I was thinking of a horizontal altitude dial, not a vertical one.
It would look a bit like an analemmatic dial laid out on the ground. I
understand how a shepherd's dial works and also how a vertical altitude
dial with (say) six curves works. I have a nice picture of the altitude
(and azimuth) dial once to be seen on a wall in the Royal Observatory at
Greenwich. It has now, alas, been lost, together with the other five
dials (planetary hours, equal hours, zodialcal signs, equation of time,
hours from sunrise and sunset) made by a Polish dialist whose name I
have sadly forgotten.
The vertical altitude dial at Greenwich was very plain and simply had a
fixed horizontal sun-hole gnomon with altitude curves (and vertical
azimuth lines) beneath it. I envisage a horizontal dial with a single
altitude curve and the vertical gnomon moving north -south to compensate
for seasonal change. Is such a dial possible?
Frank 55N 1W
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