Dear Roger (with a question for James Morrison),
You prompt an interesting side-track in your
observation that...
The national flag for Brazil also incorporates
an armillary sphere...
It seems that you are living just a bit in the past
here. Aren't we all? The flag of Brazil incorporated
an
Greetings, fellow dialists,
Thanks, all, for the communications. I think I did not make it clear
that I was thinking of a horizontal altitude dial, not a vertical one.
It would look a bit like an analemmatic dial laid out on the ground. I
understand how a shepherd's dial works and also how a
Frank,
I made a horizontal altitude dial for the inside of a box. The date lines
are parallel to 2 edges, one of the other 2 edges is the shadow casting
object. The box has to be rotated to the sun so that the vertical edges
parallel to the date lines point to the direction of sun (cast no
Frank,
The Wikipedia article does not say proper motion, and I'm sure that was
not the reason for correcting the stars' positions on the flag of Brazil.
Rather, the stars may have been carelessly plotted on the original flag
(even if shown more accurately than on the flags of many other
Dear Frank
I cannot help you with the dial you construct but I can help with the lost
Greenwich dials by a Polish dialist. His name was Tadeusz Przypkowski. Mr.
Christopher Daniel wrote about the dials at Greenwich in his Maritime
Monographs and Reports (No. 28) entitled Sundials on Walls. Mr.
Yes, the armillary sphere was more prominent on historical flags of Brazil. The
white band, the ecliptic ring, is all that remains of the armillary.
My concerns on the misrepresentation of the armillary on the Portuguese flag
were based on the image in my presentation from this data source, the
Frank,
It would take some effort to make a conclusive argument as to the projection used on Brazil's flag, but the description on Widipedia says it is an orthographic projection (the projection origin is at infinity). The date and time when Crux (the Southern Cross) was on the meridian are
I tried to send the following message with a 40K diagram attached but it
bounced, so I'm re-sending it without the diagram. I thought the limit was
50K?
Brad
On Wed, Jan 26, 2011 at 4:54 PM, Brad Lufkin bradley.luf...@gmail.comwrote:
Here's a diagram of an orthographic projection centered at
I may have jumped the gun with my last statement. While the orthographic
projection clearly does not apply, several other azimuthal ones show
promise, in particular the Airy, equidistant, and equal-area.
Brad
On Wed, Jan 26, 2011 at 4:59 PM, Brad Lufkin bradley.luf...@gmail.comwrote:
I tried to
On 25/09/2010 05:01, Roger Bailey wrote:
Hi Jim,
For me, Pluto is a planet. This is based on what led to its discovery, not
the rewriting of science and history by the the new generation that knows
everything and values nothing.
For a while I was on the advisory board for the Lowell
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