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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