Hi Dave, your observation is correct : In the drawig the last part at left is missing.
In the program that draws the Monofilars Sundials there is a little error: the date lines should be traced from the date 1/1, to the date... 13/1, that is again to the date 1/1 passing through 12/1. The program doesn't draw the last segments of the hour lines between the last imputed date (in the example 12/1) and the following one (again 1/1 or 13/1 as you prefer). In the programs the date lines can be chosen every N days, the first day of every month, the first and the 15, the first, the 10 and the 20 of every month, etc. --------------------------------------- Hi Dan, I know your spherical Wenger Sundial (that I consider a brilliant idea), but I think that my interactive sundials are different even if a finger can be used also in them to point out the time. In my sundials there is no hour lines but only date lines . To explain better how they work I attach the image of a small model: the image has few details since I have had to reduce the length of the file. It is a horizontal sundial in which, for simplicity, I have traced the date lines only since 1/1 to 7/1 (one every 15 days) The hours (Standard Time) are marked on the vertical pole (it is not possible to see them in the JPG) and are equally spaced : at the top the 12 and below the 13-11, 14-10, etc. The indicator is a small sliding ring on the pole Gianni --------------------------------------------------------------------------- Ing.Gianni Ferrari Via Valdrighi, 135 41100 - MODENA (ITALY) EMail : [EMAIL PROTECTED] --------------------------------------------------------------------------- Attachment converted: Macintosh HD:Inter1.jpg (JPEG/JVWR) (0000CB1A)
