Steve,
Your simplified approach to the mirror problem is refreshing. The vessel
would need to be attached in a way that kept it stationary
frustrating if a wine glass were used. But I like the image of pouring
an offering to the dial, or the sun, in order to make a reading.
I may have missed
Extract from The Daily Telegraph (Letters to the Editor):
Back and Forth
SIR - It might be worth pointing out that the year 2002 consists of a
palindrome, being the same backward as forwards. Palindromic years occur
normally only once in 110 years (as in 1661,1771,1881, etc). However, at the
20/02/2002
2002/20/02
Alexei Pace
malta
In a message dated 1/7/2002 5:59:27 AM Eastern Standard Time,
[EMAIL PROTECTED] writes:
It is also worth recording that many of us also experienced the year 1961,
which reads the same when viewed normally or upside down; an inverted
palindrome, perhaps? There have only been three other
Greetings fellow dialists,
Dave Bell suggested that the moon was recently seen at a a suspiciously
high angle in the sky when he came out of a cinema (yes, he said it was
a cinema) near midnight. He guessed it was barely five or ten degrees
off the zenith, surely impossible in his latitude,
Furthermore, at two minutes past 8pm on 20th February it will be
2002.20/02/2002. I believe this does not hold in the US, where they
write the date differently. Spoilsports!
Frank 55N 1W
--
Frank Evans
You couldn't use pure water in the sun to float a mirror because algae would
soon grow in the water. I don't know what kind of clear liquid is used in
my Silva compass that uses this liquid to dampen the needle. Perhaps there's
a little alcohol added to keep it sterile.
John
John L.
There was a lunar eclipse last week during the full moon. This would place
the moon directly on the ecliptic. Since an eclipsed a full moon is exactly
opposite the sun, it acts like the sun six months from later or earlier
(Like the sun in the summer).
John
John L. Carmichael Jr.
Sundial
Sorry the Off-Topic and my english...
Hi Roger Bailey and other dear friends:
Two questions:
1) Last week i red a magazine called "Cosinus" (a french publication to
kids). One of the articles was about the highest full moon in the year being
the one closest to the Winter solstice (Northern
Hi Tony
Right now, my little mirror is just inside the window sitting on my
workbench. It is so sensitive to small vibrations that the sunspot quivers
when I play music and when I walk across the room!
John
John L. Carmichael Jr.
Sundial Sculptures
925 E. Foothills Dr.
Tucson Arizona 85718
Sorry to have started on off topic hare running ... but having started :-
19.11.1999 was unusual in that every digit in the date was odd. This will
not happen again for 1112 years, not until 1.1.3111 in fact.
The last all even day was 2.2.2000, the first one since 28.8.888, a gap of
(surprise)
John Carmichael wrote:
You couldn't use pure water in the sun to float a mirror because algae would
soon grow in the water. I don't know what kind of clear liquid is used in
my Silva compass that uses this liquid to dampen the needle. Perhaps there's
a little alcohol added to keep it sterile.
Bill Gooesman wrote
Well, if you write your 2's in the same shape that they are formed in an
older LCD display calculator, then 2002 reads the same upside down as right
side up. So there.
and we in the UK have the village of CHIDEOCK with a horizontal line of
symmetry.
Tony M.
John Carmichael replied:
Right now, my little mirror is just inside the window sitting on my
workbench. It is so sensitive to small vibrations that the sunspot quivers
when I play music and when I walk across the room!
Interesting to have the seimometer aspect confirmed John. The
alternative
It being my birthday, I appreciate this much. By the way, the ISO way of
writing it (2002-02-20) doesn't work so well, but we cannot have
everything -- as my son would say, where would we put it?
John
Oregon
- Original Message -
From: alexei.pace [EMAIL PROTECTED]
To:
The Shaws wrote:
Extract from The Daily Telegraph (Letters to the Editor):
Back and Forth
SIR - It might be worth pointing out that the year 2002 consists of a
palindrome, being the same backward as forwards. Palindromic years occur
normally only once in 110 years (as in
Hi everyone,
Fer is right in saying that with Latitude =
2*TiltOfTheEarth near the summer solstice
the reflected ray 'goes back', so you have to move
the mirror inwards. Anyway, we'll always
have this kind of limitations when dealing with
mirror dials... just imagine what happens with
the
Hi Rui,
I like the interactive projects that you are proposing. The best way to
learn is to do. I am amazed at what this interest in sundials has taught me.
Books and computers do not teach as well as an activity. Observations,
measurements and calculations are the best way to learn a subject.
Dear all
To Judge by Judith's reply I clearly spoke out of turn (albeit from that
road that leds to hell!).
My apologies for any offence given.
Regards
Andrew
At 13:20 4/1/02 -0500, Romano, Judith wrote:
Dear Sundialists:
Thank you again for your notes of assistance and comments. This
The Shaws wrote:
Extract from The Daily Telegraph (Letters to the Editor):
Back and Forth
SIR - It might be worth pointing out that the year 2002 consists of a
palindrome, being the same backward as forwards. Palindromic years occur
normally only once in 110 years (as in
Hi Steve:
you wrote:
Isn't the problem down there in Tucson that the water would evaporate
before
any algae has a chance to grow?
If the container is sealed with glass, the water couldn't evaporate, and the
algae would grow. But you'd also get great amounts of condensation on the
glass which
The BSS sundial glossary has the following entry under Types of Dials:
reflecting ~: these dials have no gnomon, but reflect sunlight by means
of a semi-cylindrical mirror, set with the axis of the mirror parallel
to the polar axis. The mirror reflects the light to form a caustic curve
amongst
[David]
What is a caustic curve?
See the website:
http://www.cacr.caltech.edu/~roy/Caustic/
A simple Java applet demonstrates how a caustic curve is formed by
parallel light rays bouncing off a cylindrical, reflective surface.
Tim
Hello David,
See BSS Bulletin 98.1, page 30, _Reflecting Sundials_ by C.M. Lowne.
The article includes a section, The Cycloid as a Reflector, mentioning
that the cusps (of the reflected caustic) are neither evenly-spaced with
time nor did they lie on a straight line. However, the edge of
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