Hi Mac and all, I am afraid I don't quite understand the question. John would not like analemma shaped hour lines, you wrote. How might figure-8 shaped hour lines be used here??
One can simply incorporate the EoT into the hour lines of a common polar dial as a function of date, running from January to December. No figures-8, just somewhat wavy lines. And a date scale, of course. If one would manage to make a wavy gnomon, one gets a wavy shadow falling on straight hour lines. Not much of a difference, I would say. And one would also need a date scale to read the time. So what is the question actually? Regards, Frans 53.1N. 6.5E ----- Original Message ----- From: "Mac Oglesby" <[EMAIL PROTECTED]> To: "Sundial Mail List" <sundial@rrz.uni-koeln.de> Cc: "John Close" <[EMAIL PROTECTED]> Sent: Monday, December 09, 2002 3:21 PM Subject: 3-D gnomon for Polar Dial > > Hello All, > > John Close has posted this message on the NASS Message Board: > > "Does anyone have any ideas for a Polar Dial which allows for an > Equation of Time adjustment. I would not like analemma shaped hour > lines as I think this would detract from the simplicity and > minimalistic quality of a Polar Dial. I am told an analemma shaped > gnomon for a polar dial would be hideously complicated and probably > not work . Any ideas anyone? John Close" > > > John has discussed this problem with several members of this list, > including me, Bill Gottesman, John Davis, and Pete Swanstrom. Some of > us think that a 3-D gnomon could be designed for use with straight > hour lines to correct for EoT, and some are skeptical. > > Please share your comments and suggestions. > > Best wishes, > > Mac Oglesby > > P.S. Since I do not know if John Close is a member of this List, > please cc to him. > - > -
