Dear Kurt, Many thanks for your help. I shall try to remember Gmünd as an important place and, like Greenwich, it begins with 'G' :-)
You have four abbreviations: WOZ, MOZ, MEZ, MESZ We agree that the English equivalents are LAT, LMT, CET, CEST. My thesis is that we need two more names for times. Here is why... Suppose you have three sundials at 10° E (in Hamburg?) which is 5° west of Gmünd. Sun time in Hamburg is therefore 20 minutes earlier than sun time in Gmünd. Sundial I: this is a traditional sundial. It shows WOZ/LAT. It is 20 minutes early compared with a traditional sundial in Gmünd. Sundial II: this allows for 5° of longitude difference and shows WOZ/LAT at Gmünd. We have no simple description for this in German or English? Could we call it GOZ for Gmünd Ortszeit?!! Unfortunately, this would not be understood by anyone except you and me! Sundial III: this is a modern sundial with analemmas as hour lines and it could be set up to show MOZ/LMT at Hamburg OR it could be set up to show MEZ /CET (which is MOZ/LMT at Gmünd) and, of course, it could alternatively show MESZ/CEST. Summary: we can describe the time on Sundial I or Sundial III (all three versions) but I want to describe the time on Sundial II. Most new sundials in the USA and many new sundials in England show 'WOZ/LAT on the reference meridian'. I find it strange that there is no well-known description. Very best wishes Frank On Sat, 30 Nov 2019 at 19:02, <[email protected]> wrote: Dear Frank, > > I think the most important thing is: > > WOZ (LAT) does not comply to an absolute position: it always defines the > local time defined by the local Sun position only. So WOZ (LAT) in > Grieskirchen is different from WOZ (LAT) in Greenwich or from WOZ (LAT) in > Gmünd/Lower Austria which is exactly at 15° East meridian. > > Whereas MEZ is defined as MOZ at the 15° East meridian. > > WOZ, MOZ, MEZ, MESZ just exist in the German language. > > I did not know about the other meaning of WOZ resp. FET in international > terms. I think it is "semiofficial". > > The longitude offset from 0° in my terms is calculated by the EoL - the > equation of longitude: > EoL = LONGITUDE [°] / 15° * 60 min. > > We all know about the second parameter which is the EoT - the equation of > time: > EoT is about +/-15 min depending on the season. > > And finally: > LAT = UTC + EoL + EoT. > > Yes, there are another abbreviations running by sundial builders and time > keepers and so. > > Regards > Kurt > >
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