Hello again;
Okay I made this change, that threaded rod is a right angle
to that pipe which is my co-latitude.
The pipe is the equatorial plane and the threaded rod is the
actual angle of the earth's axis.
http://i1195.photobucket.com/albums/aa396/JohnnyRingo131/newsundial002.jpg
Then I put this little dial face on it. 12 noon is at the
bottom and I also have my longitude facing north. The shadow
from the threaded rod gnomon casts a shadow on the globe
wherever it is solar noon. The photo is looking south.
http://i1195.photobucket.com/albums/aa396/JohnnyRingo131/newsundial001.jpg
Then I made this longitude dial face. My longitude 116' is
facing north or down. You can see the longitudes line up
correctly with the globe. The time of that photo was just
before noon here.
http://i1195.photobucket.com/albums/aa396/JohnnyRingo131/newsundial003.jpg
Just a model, but you get the idea.
brent
On 7/14/2011 8:43 AM, Willy Leenders wrote:
Brent,
The axis of your globe has to make an angel with the
horizontal plane, equal to the latitude.
Se on my website such a sundial on page
http://www.wijzerweb.be/maaseik002A.html
Click on the thumbnail pictures to enlarge
The text is in dutch language.
Below a translation of the text after the word
'Beschrijving' (description)
The sundial has the look of a globe. Its axis is tilted to
the north at an angle of about 51° (the latitude of Maaseik)
with the horizontal plane. Meridian lines serve as the hour
lines. The meridian line of Maaseik is the 12-hour line. It
is directed to the south.
An auxiliary device has a tube on four supports. This device
is placed so that the sun shines through the tube and a
light spot falls on the globe. The meridian that pass
through the light spot indicates the hour.
The light spot indicates the place in the world where at
that time the sun is directly on the head of the people
standing there (at the zenith).
At the photograph (taken on May 28, 2003) it is a few
minutes after 16 hours (solar time in Maaseik). The sun is
at its zenith in the Atlantic, northeast of the Caribbean.
Willy Leenders
Hasselt in Flanders (Belgium)
Visit my website about the sundials in the province of
Limburg (Flanders) with a section 'worth knowing about
sundials' (mostly in Dutch): http://www.wijzerweb.be
Op 14-jul-2011, om 16:36 heeft Brent het volgende geschreven:
I was think about putting my globe out in the sun and
align the axis stand facing north/south. Then align my
longitude due north.
Then put a gnomon on the top as an extension of the axis
to see if this would work as a longitude sundial.
While I was contemplating this I noticed a little dial on
top of my globe that I never paid attention to before. It
looks like a sundial clock of some sort. It has daylight
and darkness and numbered 6 to 12 then 12 to 6.
Ahh, if I line up the little dial with my longitude and
local time, it allows me to know the time around the world.
Sorta, if the time lines followed longitude lines which
they don't.
What is this called and what's it for?
thanks again;
brent
On 7/14/2011 7:08 AM, Brent wrote:
Hello;
well that's cool, I never made that connection until now.
Maybe if you sliced the earth in half at the equator and
drew lines on the bottom half from the core to the lines of
longitude on the surface you would end up with my dial face.
A longitude clock.
Hmmm, I wonder if I could make a sundial based on this. It
might be a fun exercise.
brent
On 7/14/2011 3:52 AM, Frank Evans wrote:
It's called longitude (well, nearly). More accurately, the
westerly hour angle of the true sun (WHA), familiar to
ancient navigators .
Frank 55N 1W
On 18/01/2011 20:03, Brent wrote: Hello;
If you think about it, hours, minutes and seconds are an
awkward system for using time.
My idea would be to switch to a 360 degree clock.
The earth is round and makes one complete revolution per
day, 360 degrees. So why not measure time based on what
angle of degree the earth happens to be at your location.
Midnight could be 360 degrees
6AM 90 degrees
Noon 180 degrees
6PM 270 degrees
For conversions:
Each hour would equal 15 degrees.
Each degree would equal 4 minutes.
Each degree would equal 240 seconds.
So instead of saying it's 6:34am and 28 seconds
it would be:
6x15 = 90
34/4 = 8.5
28/240 =.117
The time would be 98.617 degrees
Of course you wouldn't do conversions, you would just look
at your new 360 degree watch.
If I came to work at 98.617 degrees and left at 187.786
degrees I have worked:
187.786 - 98.617 = 89.169 degrees
Makes more sense to me.
Did anyone ever tell time this way?
It seems like it would work nicely with sundials.
brent
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