Gordon, To calculate a ceiling dial you may use my program Zonwvlak. You can use any orientation of the mirror to test what will fit best.
Best wishes, Fer. Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: Gordon Watson <[EMAIL PROTECTED]> To: <sundial@rrz.uni-koeln.de> Sent: Tuesday, May 02, 2000 6:10 PM Subject: Ceiling Dials > Greetings from Devon, England. > > Anyone made a ceiling dial--a mirror by a window > projecting the sun's image onto the ceiling marked > with hour lines? I have been considering making > one for years and am hoping to find information > on the net, but so far without success. Do you > know of any ceiling dial articles on the net? > > Issues that have come to my mind include: > > 1. Mirror mounting/size/shape. > 2. Whether to raise or tilt the mirror in order to > to reflect the sun onto the ceiling on more days > of the year or at more convinient times of the day. > 3. Perhaps include an analemma (or two) with dates marked. > > I have found the reference to an article in the March 1996 > issue of the NASS Journal entitled "A Kitchen Ceiling Analemma" > by Woody Sullivan. Also, in the April 2000 issue of Sky & Telescope > in the "25 Years Ago" section, the April 1975 front cover is reproduced > sporting a tantalising photograph of analemmas painted on a ceiling. > > Gordon Watson > Lat. 50:30 N, Long. 3:45 W > >
