NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Working Analemma
From: Bill Noyce
Date: 2006 Nov 12, 10:49 -0500
From: Bill Noyce
Date: 2006 Nov 12, 10:49 -0500
On 11/11/06, James R. Van Zandtwrote: > > > > Lu Abel wrote: > > > The UPS "analemma" is a stainless steel path about 2 inches wide, > > inscribed at about 10 day intervals. It was constructed based on a > > set of plans provided by a professor who had to very carefully > > calculate the distortions induced by the location of the mirror. > > Although it hasn't been in service for a full year, I hear it's > > doing fine so far.... > > I assume that it works at solar noon each day. I wouldn't be > surprised if they need to post a conversion table between solar time > and what the clocks are set to. No, that's what the "width" of the figure-8 analemma is for. It corrects for the equation of time. Of course, daylight-savings time is a different problem. > > Which reminds me - do you remember the analemma that Tom Hanks' > character drew in the cave in Castaway? He used it as a calendar. > Except that he could only have created or used it if he had accurate > time. Yeah, what a shame. It was such a beautiful idea. -- Bill --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---