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
-----Ursprüngliche Nachricht-----
Von: Frank King [mailto:f...@cl.cam.ac.uk]
Gesendet: Samstag, 30. November 2019 15:57
An: Jürgen Hoefeld <juergen.hoef...@gmail.com>; kepler...@gmail.com
Cc: Frank King <f...@cl.cam.ac.uk>; sundial@uni-koeln.de
Betreff: Re: Worldwide project EarthLAT1200.org
Dear Jürgen and Kurt,
Thank you both very much for your explanations:
WOZ =A6 Wahre Ortszeit =3D LAT =A6 Local Apparent Time
MOZ =A6 Mittlere Ortszeit =3D LMT =A6 Local Mean Time
My memory must be fading=21 I had forgotten Ortszeit and, now, I remember
that Reinhold Kriegler explained Ortszeit to me several years ago=21
This list needs a third time...
What do you say if a sundial allows for a longitude offset from the
reference meridian of your time zone?
What is the name of the time on a sundial which shows Wahre Ortszeit at 15
degrees East (the most important reference meridian in Europe)?
There is no agreement about this in England. Here the Greenwich Meridian is
our reference. We could say Greenwich Apparent Time, GAT, but I have never
seen this. It would be GAST in summer :-)
We could say Greenwich Solar Time but that would make GST which would be
ambiguous: GST means Greenwich Sidereal Time so it would be a bad name=21
I can see an ambiguity with WOZ because I think WOZ can also mean Weiter
Osteurop=E4ische Zeit. You can read about it here:
https://de.qwertyu.wiki/wiki/Further-eastern_European_Time
This is a very curious time :-)
Very best wishes
Frank
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