This is from the mailing list for historic instruments. > Gesendet: Dienstag, 01. Februar 2022 um 10:07 Uhr > Von: "William Overington" <[email protected]> > An: [email protected] > Betreff: [rete] Do sundials settable to anywhere in the United Kingdom exist? > > I am not an expert on scientific instruments, but I have been interested > for many years. > > I have been thinking about sundial design and I have thought of a > design. > > Is it original or has this been done before please? > > I live in rural Worcestershire and so I have realized that sundials such > as are often seen offered for sale in garden centres will, quite apart > from anything to do with the equation of time, be out by about 8 minutes > in Worcestershire as Worcestershire is around one hundred miles west of > Greenwich. > > So I wondered if sundials exist adjustable as to gnomon angle so as to > be settable to latitude, and being constructed of a disc with the gnomon > on it and a surrounding annulus settable relative to the disc to > difference in longitude from Greenwich, the annulus having clock time > information engraved upon it. > > In addition I am wondering if the clock time engraved on that annulus > can be represented not by one circle with a mark for each hour but by a > wide annular ring such that for each hour of clock time there is a > curved line from inner edge to outer edge, with the annular ring having > upon it twenty-five circles, two for the first of January, one on the > inner edge of the annular ring and one on the outer edge of the annular > ring, and one for the first day of each of the other eleven months, and > one for a day near the middle of each month. So the circles not quite > evenly spaced as months do not all have the same number of days. This so > as to include the equation of time in the design. > > Maybe an original design, maybe not. Could we discuss this please? > > William Overington > > Tuesday 1 February 2022 > > > Do not reply to this message UNLESS you want to reply to the whole list. > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
