RE: Sun path polar chart generator

The link given by Peter is wrong. The file is http://www.math.bas.bg/complan/valhrist/az-ht.bas A screen shot is attached. I hope this will help! Valentin Hristov From: sundial on behalf of Peter Mayer

Re: Sun path polar chart generator

Hi Dan, Valentin Hristov wrote a DeltaCad program Az-Ht.bas which does much of what you want, I think. With a bit of modification, you could put the Oughtred dial parts into a separate layer. You can down load Valentin's program at: www.math.*bas*.bg/~complan/valhrist/*az*-*ht*.*bas* * *

Re: Dial face colouration

John, thanks for the clarification, and your patience with my questions. All, I'm off to buy some photographic mattes to do experiements with. This is all about having a horizontal dial face that is not too bright to view even in the summer midday sun - so I'll go quiet now and report back

Re: Sun path polar chart generator

Hello Dan, Helmut Sonderegger's Sonne software can generate such a chart. Choose the type as "horizontal altitude" and try various options. Sonne is available here. http://www.helson.at/sun.htm Regards, Roger Bailey From: Dan-George Uza Sent: Monday, February 27, 2017 12:10 PM To: Helmut

Re: Dial face colouration

Hi Steve, I'm sorry I've confused you. The experiments reported in the 1941 UK paper were limited to illuminances not exceeding 10 000 lux. For that reason I had to admit that higher illuminances might well point to a different conclusion. I certainly did not intend to suggest that reflected