Hi Maciej,
Thanks for your recent post. Since no one seems to have replied to your
plea in the final paragraph for software to draw a
stereographic/Oughtred dial, here are some existing open software options:
* Gian Casalegna's _Orologi Solari_ will draw one: azimuth:
horizontal/vertical: astrolabe
*Helmut Sondereggers' _Sonne_ will draw at least a horizontal
stereograph: Azimuthal: Sun Altitude
* Valentin Hristov has written some elegant code for DeltaCad
:www.math.bas.bg/complan/valhrist/az-ht.bas [When I tried to re-run it
a few minutes ago, it now seems to be stuck in a loop which I haven't
had time to debug. I've attached an example which I created about 4
years ago].
So: no need to create a stereograph by hand!
best wishes,
Peter
On 27/10/2022 4:02:34, ml...@interia.pl wrote:
CAUTION: External email. Only click on links or open attachments from
trusted senders.
Dear All,
As proven in a separate tread on "Sun elevation tool/ horizontoscope",
stereographic projection is
a fascinating geometric construction with great potential in gnomonics.
During last year I explored the idea of vertical stereographic sundial
and it resulted in
a paper describing several stereographic sundial types:
- vertical stereographic sundial, for walls of any declination and for
any latitude,
- four-sided stereographic vertical sundial, attractive for its
“gnomon-less” form,
- double – stereographic & polar – vertical sundial for walls of any
declination, a vertical reference to Oughtred’s horizontal design,
- folded pocket, double stereographic & polar – vertical sundial
- inclined, proclined and polyhedral stereographic sundials
The paper can be downloaded free of charge from Cursiva publishers
website:
http://cursiva.pl/e-ksiegarnia/vertical-stereographic-sundial-properties-construction-and-related-instruments/
<http://cursiva.pl/e-ksiegarnia/vertical-stereographic-sundial-properties-construction-and-related-instruments>
or from Academia.edu website:
https://www.academia.edu/88820719/Vertical_stereographic_sundial_Properties_construction_and_related_instruments
<https://www.academia.edu/88820719/Vertical_stereographic_sundial_Properties_construction_and_related_instruments>
Have fun with it !
Vertical stereographic sundials offer plenty of possibilities for
sundial makers
and I believe might be a very interesting addition to existing sundial
types.
As the geometric construction of vertical stereographic sundials with
CAD software is time-consuming,
it would be great to include it in existing sundial design software.
I kindly ask sundial list members running such software, please
consider it !
Regards,
Maciej Lose
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Department of Politics & International Relations (POLIR)
School of Social Sciences
http://www.arts.adelaide.edu.au/polis/
The University of Adelaide, AUSTRALIA 5005
Ph : +61 8 8313 5609
Fax : +61 8 8313 3443
e-mail:peter.ma...@adelaide.edu.au
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