You are right Bill. That's a great idea! I had never thought about it, but it's true. A flat circular disk that permanently mounted parallel to the dial face will always cast a circular shadow on the face. It's such a simple concept, I wonder why nobody's ever mentioned this before. Do you know of any dials with this type of nodus? I don't.
----- Original Message ----- From: <[EMAIL PROTECTED]> To: <sundial@rrz.uni-koeln.de> Sent: Monday, July 12, 2004 12:23 PM Subject: Re: Turtle Bay Sundial Bridge opens > My own preference is for a flat circular disk, oriented parallel to the dial > face. This nodus produces a circular, not elliptical, shadow at all times and > dates (i.e. regardless of the sun's position). This may seem counter > intuitive, but it is true. > -Bill Gottesman > > In a message dated 7/12/2004 11:44:42 AM Eastern Daylight Time, > [EMAIL PROTECTED] writes: > > > Hi Jim: > > > > I've always thought a sphere would be best for most nodi (or is it > noduses?) > > A sphere produces a shadow that is usually elliptical (except when the sun > > is directly overhead, then it's a circle) so it is fairly easy to > > guesstimate where its shadow's center is > - > -
