Thank you for this thread. It inspired me to add a spider H dial to my DeltaCAD macros for (1) analemmas, and (2) horizontal dials.
I did not add them to my FreeCAD, NanoCAD, PowerDRAW, and online java script programs as I have been too swamped. It has now been more than 50 years that I have programmed in various languages! Have a safe Memorial day Simon Wheaton-Smith www.illustratingshadows.com Phoenix AZ On Thu, May 26, 2016 at 9:49 AM, Kevin Karney <[email protected]> wrote: > Dear Helmut > > I have made such a dial for a friend in 5mm bronze, (so its gnomon is 5mm > wide). It was cut with a water-jet (cost £250) and photo etched (cost > £210). It contains sunrise and sunset lines. Somewhat similar to yours as > far as density of hour lines etc, but somewhat smaller. > > The design was accomplished entirely from Python code (more than 2000 > lines of code - a lot of which are the very precise astronomical > algorithms). I made a number of laser-engraved/cut maquettes from 5mm > plywood (about £10 each) to get the final design approved by my friend's > children who paid the bill. The software produced 3 different images - one > for there laser-cutter, one for the water-jet cutter and one for the > photo-etchers. > Now I can produce a design similar to this one at any other Lat/Long in a > very short time. > > I'll send you other pictures by separate e-mail > > The only other dial of this type I know in in the Parkes Observatory in > New South Wales, Australia. You can find one image of it with a Goggle > search "Parkes Observatory sundial" > > Best regards > Kevin Karney > Freedom Cottage, Llandogo, Monmouth NP25 4TP, Wales, UK > 51° 44' N 2° 41' W Zone 0 > + 44 1594 530 595 > > On 23 May 2016, at 18:54, Helmut Haase <[email protected]> wrote: > > Hi, > I have designed and realized a horizontal spider sundial with polar pointing > wide gnomon, see details below and photo (in a second approach sadly reduced > to 47 kB now). *Does anyone know **s**uch a sundial* *anywhere else?* I > found many spider sundials but none with a *wide* polar gnomon. A photo > link or any other information would be great? > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > -- Simon Wheaton-Smith www.illustratingshadows.com Phoenix, AZ W 112.1, N 33.5
--------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
