RE: Solar synchronizer (Andrew Pettit)
Dear colleagues, You may be interested to know that the 3-D cam for the EoT mechanism (looking like a piece of modern sculpture) was on show at the 2008 BSS Conference at Latimer. A photograph of it is in the report of the conference in the BSS Bulletin, 20(ii), June 2008. Regards, John Davis John Goodman <[EMAIL PROTECTED]> wrote: The equation of time is not ignored by the Long Now clock. In one of their FAQs they state: > The clock is projected to be accurate to within one day every 20,000 > years, but just in case it isn't, a solar synchronizer will correct > the time shown on the clockface. A lens on top of the clock will > advance or retard the display by phase-locking to the local noontime > sun. The digital mechanical design also allows the clock to adjust > for leap days, leap years, leap centuries–even for the precession of > the equinox The mechanism for accommodating the EOT is described and pictured here: http://www.longnow.org/press/articles/ArtSoftwareDev.php#sidebar Dr J Davis Flowton Dials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: Solar synchronizer (Andrew Pettit)
The equation of time is not ignored by the Long Now clock. In one of their FAQs they state: > The clock is projected to be accurate to within one day every 20,000 > years, but just in case it isn't, a solar synchronizer will correct > the time shown on the clockface. A lens on top of the clock will > advance or retard the display by phase-locking to the local noontime > sun. The digital mechanical design also allows the clock to adjust > for leap days, leap years, leap centuries–even for the precession of > the equinox The mechanism for accommodating the EOT is described and pictured here: http://www.longnow.org/press/articles/ArtSoftwareDev.php#sidebar > Date: Mon, 14 Jul 2008 16:30:22 +0100 > From: "Andrew Pettit" <[EMAIL PROTECTED]> > Subject: RE: Solar synchronizer > To: "'Frederick Jaggi'" <[EMAIL PROTECTED]>, "'Sundial Sundial List'" > > Interesting! > > According to the video the clock synchronises to the sun at noon on > any > sunny day. > > No mention is made of the "Equation of Time" correction. > > So it will be a curious "Alice in Wonderland" type clock that tells > the > correct time by the sun precisely once on any sunny day and the > correct > civil time occasionally throughout the year! > > Or an I missing something? > > Regards to all > > Andrew > > > PS ~ for those that remember an earlier posting "Help Oscar" I am > planning a > "sundials day" at his school tomorrow. Let me know off list if you are > interested in feedback. > > > > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > ] On > Behalf Of Frederick Jaggi > Sent: 10 July 2008 23:53 > To: Sundial Sundial List > Subject: Solar synchronizer > > There's an interesting tour in San Francisco to take place on July > 12. One > of the locations on the tour is the Long Now Foundation 1 year > clock > which features a solar synchronizer (hence the sundial relevance!). > See: > http://www.longnow.org/mechanicrawl/ and link on the solar > synchronizer link > on the right side of the page > > > Fred Jaggi > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
