Use the best clock of all, the Sun (or Earth, if you prefer that new notion of Copernicus') - a photocell to track the Sun, advancing the mechanism one tick per day.
Dave > Bill > > All we need now is a good clock to control the mechanism which compensates > for the EoT? > > Brian Albinson > ----- Original Message ----- > From: Bill Gottesman > To: Robert Bargalló > Cc: [email protected] > Sent: Sunday, September 27, 2009 10:24 AM > Subject: Re: Fwd: Direct reading time. > > > I like it. I would like to hear the story of how it was designed and > fabricated. Is it located at a residence or a public place? > > -Bill Gottesman > Burlington, VT > > Robert Bargalló wrote: > > > > ---------- Forwarded message ---------- > From: Robert Bargalló <[email protected]> > Date: 2009/9/17 > Subject: Direct reading time. > To: Robert Bargalló <[email protected]> > > > > Hello All, > When an inexperienced person examine a well constructed Sundial, often > underestimate the instrument because it is not marking the official > time and having to make some antipathetic corrections of the > indicated time. That is the main reason we have built a sundial that > gives civil time accurately, enough to adjust the minute a non solar > clock that it has stopped. In a word, in our quadrant needless resort > to the equation of time or to the local position versus the Meridian > corresponding to the time zone. No arithmetic corrections are needed. > Descriptively, the device is a horizontal sundial with a gnomon > consisting in thin thread nylon. The mechanism presents a 48 teeth > gear, powered by an endless screw, which allows the entire clock to > rotate some degrees around an axis parallel to the Earth rotation axis > (around the gnomon). In other words, the mobile set plays like a > hypothetical sundial indicating the exact civil time is elsewhere, in > another position but in the same geographic parallel. As to the > accuracy, the quadrant presents marks of all the minutes from the 5 h > 45 a.m. until the 8 h 15 p.m. The single need featuring the device is > that one or twice a week requires adjusts a rotatable knob to indicate > the current date. This disc, of course, acts on the endless screw and, > for that reason, on the rotation. > > Really, the rotation movement compensates not only the equation of the > time, but also the error caused for the geographic longitude position > of the instrument. > > For the same method we can use the sundial giving 3 types of time: the > local solar time, the standard time, or the daylight savings. > > Since we installed it, from November 2006 to date, it has indicated > time with an error that in no case exceeded one minute. > Happy Dialling! > > > Robert Bargalló > More information at next blog > > > ---------------------------------------------------------------------------- > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > ------------------------------------------------------------------------------ > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
