Ron wrote: <<I've never built a ceiling dial, but something doesn't sound right about the advice that you got. The days that you choose should be days where the "equation of time is 0 (sun time and watch time agree). This happens 4 times a year. April 15, June 14, Sept 1, Dec 25.>>
But clocks and dials DON'T coincide on these dates UNLESS you just happen to live on your prime meridian. If you want to apply the "normal" Equation of Time correction, you will have to work out which days coincide at your own longitude. Where I live (3 degrees West of Greenwich) clock and dial only coincide on 2 days a year. If you live more than about 5 degrees away from your meridian, they will never coincide. See: http://homepage.ntlworld.com/jmikeshaw/ and follow the link to "Equation of Time slide rule" first, and then "Noon Mark" Mike Shaw N 53º 21' 24" W 03º 01' 47" Wirral, UK. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.307 / Virus Database: 168 - Release Date: 11/12/2001
