Hello everyone:
Well my new website is finally up and running WITH PICTURES! But I am still
working on the text and I have a question. I'd like to say that my sundials
are "heliochronometers". My sundial books state that heliochronometers are
very accurate sundials. But what criteria is used?
Hello all dialists!
My new website, "Sundial Sculptures by John L. Carmichael Jr.", is finally
completed and ready for your critical inspection. I did not realize how
difficult it would be to do this, which explains why it took so long. I
think, though, that it will constantly change as my sund
Hello dialists:
Ooops! Yesterday I made a little typo error in my new website address. The
CORRECT address is:
http://www.azstarnet.com/~pappas
Mia culpa
John Carmichael
p.s. thank you John Pickard for persevering!
Hey, did anyone see the CNN story last night about the watch company
,"Swatch" that is now selling timepieces which tell "Internet Time"? I
can't remember exactly, but they said one minute of normal time=about 1 1/2
minutes Internet Time, and that the idea behind it is to facilitate
timekeeping a
Hello all,
If in the future, everybody everywhere switches to Universal Time then all
timepieces would have to have twenty-four hour timescales. Right? Would'nt
all twelve hour clocks, sundials, watches, etc. become obsolete, becoming
anachronistic collector items? Sort of like vinyl record a
Hi guys,
If the earth's rotation is slowing, due to lunar tidal drag, then in what
year will it stop completely? Will one face of the earth, presumeably the
side with the most mass, permanently be facing the sun, just as one side of
the moon permanently faces the earth? Which side of the earth
Hello All Timekeepers:
First of all, let me say that this has been a very interesting discussion!
To summerize, it seems that our measurement of time will always be linked to
the earth's rotation rate, because as daylength changes, so will our
biological clocks.
Consequentially, if we keep a 24
Hello all:
Will two full moons always occur in a March that follows a Febuary with no
full moon?
John Carmichael
Tucson
Hello all:
Does anybody know the exact time (UT) when the Equation of Time equals zero
this April 15th (or is it the 16th)?
Thanks
John Carmichael
Tucson
Hello all:
The reason that I inquired as to when the Equation of time equals zero is
because I state in my Sundial owner's Manual that on these four days (Apr
15, Jun 14, Sep 1, and Dec 25) my sundials need no EOT correction. I
realize that this statement is not entirely correct as the date whe
Hello yall:
What I've been trying to do is to tell my sundial customers that there are
four "magical" days of the year when their sundial keeps perfect Standard
Mean Time. (The dials are already corrected for longitude and DLS Time). On
these four days, they don't need a copy of the EOT to tell
Hello All:
I too just read Jim Morrison's EOT equations with great interest but I have
not digested them yet. I don't know if they are true or false. Even if
they are incorrect, that is no reason for Fernando to have lashed out
against Jim. I think Jim has been a valuable and intelligent membe
Hello Fernando, the jerk in New Mexico, and everybody else:
Since I was the first person on the list to read and reply to the faux
Fernando's insulting message, and not suspecting that a forger was at work,
I publically denounced Fernando. Thank goodness that many of you quickly
identified the
Hello Old Timers:
I've got another knit-picky question for you all to ponder. But you're a
rather knit-picky group, so I don't think you'll mind.
In proofreading the new fifth edition of my "Sundial Owner's Manual", when
discussing sundials, I think that I mistakenly used the words, "precise" an
Hello Ross:
So good to hear from you again. I should have known that you would be the
one to come up with mathematical definitions of "precise" and "accurate".
It is obvious that you have thought about this before, in connection with
your own sundials.
Yes, your definitions and explanations m
Hello Nit Picking Old Timers:
Well, well, well; you are all truely amazing. I have given up on trying to
write to each of you individually to thank you for your answers to my
question about the definitions of "precise" and "accurate". The response
was unbelieveable. I lost count at about 30!
Hello Charles & all others:
You're right, the "fuzz zone" is the prenumbra, not the umbra. (mia culpa)
It seems that we are in agreement that the center of the preumbra is the
place where the shadow of the style's edge would be if the sun were a point
light source, and that this point can be es
Hello all:
I was just thinking that on a horizontal sundial that the true shadow point
would ONLY be at the center of the penumbra at high (apparent) noon. In the
late afternoon or early morning, the sun would be to the side of the style,
causing the shadow to strike the dial face at an angle.
Hello dialists:
Three years ago I built an equitorial interactive mechanical
heliochronometer of brass and wood based on the design described in chapter
xII, pgs. 193-202 of the Mayall's book. "The heliochronometer consists of
four basic parts: base, dial plate, alidade or sighting instrument, a
Dear Francois:
I ran your coordinates through the mapblaster program and determined that
indeed they are for the location of City Hall, downtown. I didn't check
other cities, though. In the mapblaster program there is an option similar
to your's for which you give mapblaster the name of the cit
Hello All:
I'm glad the azimuthal discussion didn't die as I think we are finally
coming to grips with understanding it. I think it is that it is important
to point out that much of the confusion on this subject has resulted from
poor understanding and misuse of sundial terms. The terms "Dali,
Hello dialists:
My new Celestial Products moon calendar says that there will be a total
lunar eclipse at 4:41 UT on January 21 (the evening of Jan. 20th in North
America).
We have already discussed on the list the fact that moonlight should
indicate the correct time on a sundial during totality
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