---------- Forwarded message ---------- From: Robert Bargalló <bargallorob...@gmail.com> Date: 2009/9/17 Subject: Direct reading time. To: Robert Bargalló <bargallorob...@gmail.com>
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<http://totdestriant.blogspot.com/2008/05/rellotge-de-sol-til.html>
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