Hello David and all of you east-west seekers,
With Tony Moss's 24 Hr (EoT adjusted) equatorially positioned clock, the hour
hand would be in the meridian of the sun only; but due to its declination, the
sun would usually pass due east and west before or after the hour hand,
depending on the
Hi David,
The equation you quoted is correct. Cos t = Tan Dec / tan Lat. It is easier to
calculate than it looks with a simple scientific calculator. As simple
program or spreadsheet could easily add the add the equation of time and
longitude to provide a table of clock times for each day of
x-charset utf-8Hi Alexei,
In addition to the common horizontal and vertical types, you may find
pictures of equatorial, polar, spherical, polyhedral, nodal, meridian,
bifilar, shadow plane, conical and digital dial in my sundial site:
http://www.fransmaes.nl/sundials
- Original Message
Hello all,
I think important for islamic prayers is the Qibla. Under following URL you
find the methods and formula and much background knowledge for calculating
the prayer direction to Mecca, which is quite different due to the location
you are staying.
First of all, my thanks to those people who took the time to reply to
my cry for help on this - and my apologies for a slight delay in
responding, but I had to 'clarify' a few things with the Muslim group.
The following are (I think!) the criteria that they wish to fulfill:
(1) They are not
Hello David,
Welcome to the list. You have asked an interesting non-trivial question,
deserving not just a note but a worthy of a dissertation. Let me add a few
thoughts well short of the answer.
Sundials have a prominent but generally ignored role in Muslim culture. Many
of our mathematical
David,
If this group has religious duties to pray due East or due West then that
religion must halso have the means to determine that direction, you see
that in any culture in the world. So I wonder how they found those
directions before.
It is more or less the same question I had earlier (and
Nowadays
they can find carpets on which to pray which include a small magnetic compass
in them so they can orientate towards Mecca
On another
topic, does anyone have a photo gallery of any new sundials , preferably
something ÄúinnovativeÄù not just a gnomon in the wall type of
Friends,
David Lawrence started with the thread about
finding east or west for the Muslims.
I should say: use a magnetic compass.
I think this also was done in practice aswas
done with portable sundials.
But isn't the direction to Mecca of more
importance? (Qibla)
Then use e.g. a "Mecca
Re: Is it possible to determine when the sun is due
East West?
I wanted to answer to this thread and I needed a
figure.My e-mail to the sundial list didn't pass so I offer my answer for
download at:
http://www.de-zonnewijzerkring.nl/test/mekka.htm
Together with a second figure the file is
At first sight, this looked like a 'trivial' request - but it very
quickly became apparent that I don't have enough knowledge, and so
I have joined this mailing-list in the hope of getting help from
people who may be more able to say whether it is even possible!
I am located in Northern
-Bill
In a message dated 9/16/2005 5:01:34 AM Eastern Standard Time, [EMAIL PROTECTED] writes:
Subj: Is it possible to determine when the sun is due East West?
Date:9/16/2005 5:01:34 AM Eastern Standard Time
From:[EMAIL PROTECTED]
To:sundial@rrz.uni-koeln.de
Received from Internet:
At
Hello David,
I believe that I can offer a method that might meet the requirements of
this group. However, it will depend upon the clarification of a couple of
points. What do the terms exact and precisely mean in this case? What
deviation, if any, is allowed? And can modern technology be
Hello David,
In no way am I belittling your problem, or the religious group
involved, but I can't help wondering how they determined the exact
times when the sun was due east and west at their previous location.
Or, their locations before that.
Best wishes,
Mac
At first sight, this
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