On Thu, Oct 1, 2015 at 3:55 PM, Willy Leenders <[email protected]> wrote:
> A nice project for the decoration of the roof ! > Yes, but more than a decoration. > However, it is not possible to read the true local time. > Could you explain that statement? True local time, or true local time at the central-meridian, is what sundials are marked in. They used to typically give "temporary hours", but that is no longer their usual time-system. > And one can not deduce it for the place at longitude: 24° 30′ 3.82′′ E > (Bistrita) with only the table for EOTas a tool. > If the dial is marked in true-solar-time, as opposed to true-solar-time at the central meridian, and if the EoT table doesn't incorporate the longitude-correction, then one could get standard time by adding or subtracting 4 minutes from the EoT entry, for each degree of longitude west or east of the place's central meridian. Michael Ossipoff 26N, 80W On Sun, Oct 4, 2015 at 7:13 AM, Michael Ossipoff <[email protected]> wrote: > > > On Thu, Oct 1, 2015 at 3:55 PM, Willy Leenders <[email protected]> > wrote: > > >> A nice project for the decoration of the roof ! >> > > Yes, but more than a decoration. > > >> However, it is not possible to read the true local time. >> > > Could you explain that statement? > > True local time, or true local time at the central-meridian, is what > sundials are marked in. > > They used to typically give "temporary hours", but that is no longer their > usual time-system. > > > >> And one can not deduce it for the place at longitude: 24° 30′ 3.82′′ E >> (Bistrita) with only the table for EOTas a tool. >> > > If the dial is marked in true-solar-time, as opposed to true-solar-time at > the central meridian, and if the EoT table doesn't incorporate the > longitude-correction, then one could get standard time by adding or > subtracting 4 minutes from the EoT entry, for each degree of longitude west > or east of the place's central meridian. > > > > Michael Ossipoff > 26N, 80W > > --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> >> >> >
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