In regard to Charlie Mead's question about biological clocks.
Our biological clock has been studied. Studies indicate that people who are
isolated from daylight and other temporal cues end up following a 25 hour
rhythm.
The human biological clock of course doesn't work in a vacuum. It is i
Hello George,
What you described is a simple armillary sphere. It can be used as a
sundial but if it does not have markings, it does not serve that function
well. Mount it with the arrow facing north at an angle to the horizontal
equal to your latitude.
Most armillary spheres made these days ar
Fellow Shadow Watchers.
My next series of JPEGs illustrates the making of
large (ish) dimensionally accurate discs out of thick sheet brass in the
lathe, engraving a degree scale and a matching vernier scale on a rotary
table.
If you are already on my 'sub-list' for JPEG
The recent discussions on the EOT have sparked a question in my amateur
dialist mind:
Are there any data on whether our biological clocks run on solar time or
clock time ???
(Jet-lag, I think, is another matter).
If not, this would be a fascinating project for some budding graduate
student.
Cha
Thanks Jeff. I already use this software. It is wonderful. I have found
that I get the best results in putting mathematical equations on the web by
composing the equations in Word using Equation Editor, printing to a
postscript file, converting
it to PDF format using Acrobat Distiller and then doi
"G.F.G. Willegers" wrote:
> Hello,
>
> I am completely new to this list. Recently someone gave me a sundial as a
> birthday present. Unfortunately it came without any instructions to placing it
> correctly. Can someone tell me how to place it? I am living in the centre of
> the Netherlands, at 52
Hello,
I am completely new to this list. Recently someone gave me a sundial as a
birthday present. Unfortunately it came without any instructions to placing it
correctly. Can someone tell me how to place it? I am living in the centre of
the Netherlands, at 52 degrees N, 5 degrees 30 E. The sundi
At 19:02 5/12/1999 -0800, Daniel Lee Wenger wrote:
>Thanks Jeff. I already use this software. It is wonderful. I have found
>that I get the best results in putting mathematical equations on the web by
>composing the equations in Word using Equation Editor, printing to a
>postscript file, convertin
For graphic conversion, if you use a Macintosh, consider this fine piece
of shareware:
Graphicconverter
http://www.lemkesoft.de/
It reads and writes the following formats. (see below) To do EPS
(postscript) you need a third-party utility for which there is a
separate charge. It does not do pdf,
I'll take a stab at this as I'm the first to reply, apparently; but others
will correct me if I've got it wrong, I'm sure. We have to be brave enough
to try explanations at the risk of being wrong so we can learn, eh?
If the earth orbited in a perfect circle (no ellipse) then there would be no
Hello again:
In light of Luke's very clear and informative explanation of how a planet's
orbit and the inclination of its axis affect the shape of the analemma and
EOT curves, what would the analemma look like if the orbit were a perfect
circle and there was no tilt to the axis? Would the analem
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