John Jones on Sat, 8 Dec 2018 12:36:23 -0000 typed
in alt.windows7.general the following:
On Fri, 07 Dec 2018 07:44:12 -0800, "pyotr filipivich"
wrote in article
...

John Jones on Fri, 7 Dec 2018 09:39:35 -0000 typed
in alt.windows7.general the following:
On Thu, 06 Dec 2018 15:06:24 -0800, "pyotr filipivich"
wrote in article
...

VanguardLH on Thu, 6 Dec 2018 16:34:30 -0600 typed in
alt.windows7.general the following:

Let me start by saying "thanks" for all the technical support.


pyotr told use which web browsers he uses but nothing about which
extensions he has installed into each,

Most of which I don't know, nor (sorry to say) do I care enough to
hunt down. If memory serves, I have the barebones loaded.

or what happens when he loads the
web browsers in their safe mode to eliminate modification of content by
any installed extensions. Anti-virus software that interrogates web
traffic can also affect odd behavior in a web page.

Ufda. Like I said, article was not interesting enough for me to
try to get past whatever is going wonky. Such is life - I'm "too
busy" trying to figure out how to map the alumacantor circles for a
Astrolabe. (I can figure out how to do it with a compass and rule
{aka Geometry Old School} but when I trig out the numbers, they're not
making sense. Guess I'm going to have to construct one to scale,
measure the drawing, and work back from that.)



Somewhat OT but youve piqued my interest: google hasnt heard of an
alumacantor so what is it?

Ah, there's the problem, I misspelled it. "Almucantar" from the
Arabic 'sundial'.

You want to look up Astrolabe (the predecessor to the sextant).
The Almucantar circles are how circles of latitude are transferred
from a sphere (the earth) to a plane by stereographic projection.
https://wikivisually.com/wiki/Astrolabe#Construction
While still OT all q interesting.
That's a very good article but I found
https://www.math.ubc.ca/~cass/courses/m30901a/montero/math309project.html (word wrap)

Fnord - "not found on this server"

try wait -okay, it responded tot he Hammer of reason.

Thanks, I have found this before. I'm missing something,
somewhere along the lines. "Not making sense". And I am tired.

Sigh, I channel Winnie the Pooh, and become "a bear of very little
brain, and long words [equations] bother me."


Slightly easier to read. And it contains a transcript of part of
Chaucer's explanation of use.
I also found a maple treatise where the author complains he could find
no document expounding the calculations so he had to do it all himself.
Trouble is you need maple to read the actual diagrams and they want $239
for a personal licence : so that's that.

The frustrating part of this is that goggling "constructing an
astrolabe" gets all sorts of pre-printed templates, but very little on
the mechanics of calculating where the points for the various
latitudes are located. I found myself measuring the constructed
diagram and seeing if my calculations "worked". Grumble, I had a URL
Indeed. Spherical trig: too many cosines herr mozart.
JJ
--
pyotr filipivich
Next month's Panel: Graft - Boon or blessing?