Hello John, Fer, Anselmo, Dave, et al.
Please continue to cc messages to the Sundial List, so that we can
all share in this very interesting thread. I hope that some method is
worked out so that we can also access any drawings or pictures.
Thanks.
Best wishes,
Mac Oglesby
Hi Fer, Anselmo and others who gave mathematical formulas for
reverse engineering:
When I have time after Oxford, I am going to make a Delta Cad
reproduction drawing of photo of the oldest SGS and I will indicate
the hour angles of all the hourlines and the angle of the equinox
line.
Since I am not a good mathematician, I was wondering if I could then
send you guys a copy of the drawing and you could use your
formulas on it using my drawing. And I'll use the mathless trial &
error method using Zonwvlak. Then we could compare the results.
(latitude and wall declination).
If it's as easy as Fer suggests, then it might be possible to make a
program or spreadsheet that mathematically challenged people could
use to analyze other dials with unknown latitudes and declinations.
can we do this?
(big snip)
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