Hi Fer, Thank you for checking my question. My instincts have told me that a dial on a vertical surface with a perpendicular style was possible, even if azimuthal might not be the best name for it.
You were correct - my numbers were wrong. I should have said the wall was 26 degrees south of west or 64 degrees west of south. I checked this out with your program and I get the height of style to be about -19 degrees. I have checked the declination of the wall several times and I have gotten between 25 and 26 degrees. I think 25 might have given a style (or latitude where horizontal) of around -18 degrees. It was by observation of the wall that I found the error. I can look for the North star "through" the wall, and I knew the angle was around 15- 20 but never as much as 40 degrees to the surface. Also, about now 4pm is not far from a normal to the surface - but the design you sent - the time was about 1pm. Sorry for my error. I do have a 4 foot by 8 foot piece of nice "sign" board to make this dial. I must wait for warm weather to paint because my work area is inside the unheated garage. I look forward to the project. Thank you for the help. Sincerely - Warren Thom "fer j. de vries" wrote: > I read : > latitude 42N > vertical dial, that is inclination 90 degrees > declination of dial 26 degrees from South to West > > I calculate : > The height of style ( for a usual dial ) than is : v = -41.91 degrees. > This equals to a horizontal dial at latitude 41.91S. ( not 18 as you wrote ) > Where is the error ????? > These values may be calculated with Zonwvlak.
