Hi Peter,Thank You for the links.My plea concerned vertical stereographic
sundials - not the horizontal ones. I'm aware that there are a number of
programs to construct horizontal sterographic dials.Helmut Sonderegger kindly
proposed to include vertical ones in Sonne, when he finds a time for it, and
the info form Valentin was that for the vertical plane he actually worked on a
spider dial, which is most interesting but of different type than
stereographic.But I must admit that I was unaware of construction possibilty of
vertical stereographic dials (under the name "vertical astrolabe") in Oroligi
Solari.Though, the program doesn't give any limits for the gnomon - which in
this type of instruments is no longer that 1/2 the dial's radius, as discussed
in my paper, irrespective of walls' declination, latitude and sundial's plane
inclination. It doesn't also give options for inclining dials. So there is some
space for it to be upgraded making this very nice typology more approachable
for sundial makers. Also, derivatives like the four-sided, "gnomon-less"
stereographic vertical sundial could be included.Drawing by hand (with CAD) is
obviously time consuming, but it allows for understanding of geometrical
relations behind and allows for inclusion of elements not available in the
custom software. So not being a skilful programmer, I will rather stay with
that ! But for the sundial makers it is obviously easier to use a
software.Regards,Maciej Od: "Peter Mayer"
<[email protected]>Do: [email protected]; [email protected];
Wysłane: 5:58 Poniedziałek 2022-10-31Temat: Re: Vertical stereographic sundial
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, [email protected]
wrote:
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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/
or from Academia.edu website:
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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http://www.arts.adelaide.edu.au/polis/
The University of Adelaide, AUSTRALIA 5005
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