Dear Frank,
in the context of cataloging thousands of sundials in Germany, Austria,
and Switzerland we came to the following abbreviations for sundials of
type II:
i) WOZ(G)
Here, G is for the city of Görlitz, which is located 15° E. To designate
the correction during DST we wrote: WOZ(G)+1
This abbreviation is used in the printed location compilation (released
back in 1994): Sonnenuhren - Deutschland und Schweiz (ISBN 3923422121).
ii) WOZ(15°) / WOZ(15° ö.L.)
As Görlitz is a city in Germany, people from Austria and Switzerland
would not be so happy with it to see it for their sundials. Therefore,
this more neutral version was chosen later. The correction during DST
can be designated either as WOZ(15°)+1 or WOZ(30°). In the Austrian
sundial sites compilation it is written simply as: WOZ(15)
Throughout gnomonica.de (presumed to be the largest database of sundial
locations) we use: WOZ(15° ö.L.)
ö.L. is the abbreviation for eastern longitude.
Best regards
Daniel
Am 02.12.2019 um 16:23 schrieb Frank King:
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] <http://gmail.com>>
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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