Hi John, I think you already know the time for solar noon at Kitt Peak. In your last pic you write:
high noon : 12:26:23 (plus EoT corretion of course). An accuracy of 15 seconds is still ambitious I think. In december the change in EoT is about 30 seconds in 24 hours, that is 15 seconds in 12 hours. So there is no margin left for any other possible problem. The yearly changes in the EoT aren't important. You just need a new table every year. Good luck with this dial. I admire your enthusiasm for this project. Best wishes, Fer. Fer J. de Vries mailto:[EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: "John Carmichael" <[EMAIL PROTECTED]> To: "fer j. de vries" <[EMAIL PROTECTED]> Cc: "Sundial List" <[email protected]> Sent: Sunday, May 19, 2002 7:31 PM Subject: Re: Proposal for Review > Hello Fer (& others) snip.... > I think I will just correct our radio clock time for the > this year's 12:00 solar noon value. DOES ANYBODY KNOW WHAT THIS VALUE IS? (I > could find out myself, but I'm so busy that I need a little help from you > guys right now cuz I'm really rushing to get things done.) > > So, I'm thinking I'll rewrite my proposal an give them a less ambitious > estimate of the sundial's precision. In theory and practice do you think it > is safe to forecast a precision of 15 seconds (by eyesight alone) or 5 > seconds with a shadow sharpener? > snip.... -
