On Saturday, June 6, 2015 at 9:22:16 PM UTC-7, David DeLaney wrote:
> On 2015-06-07, nu...@bid.nes <
Alie...@gmail.com> wrote:
> > On Saturday, June 6, 2015 at 2:46:15 PM UTC-7, Ken Quirici wrote:
> >> On Friday, June 5, 2015 at 10:43:56 PM UTC-4, Quadibloc wrote:
> >> > On Friday, June 5, 2015 at 3:39:12 PM UTC-6, Moriarty wrote:
> >> > > It wouldn't matter because, wisely, they didn't bother putting
> >> > > cardinal directions on the map at all.
> >> >
> >> > As David DeLaney pointed out, cardinal directions are not needed.
>
> ... well, actually, that wasn't the point of my comment at ALL. And apparently
> nobody did get it. Ah well.
I got it but Oz never grabbed me the way it does many people (enough that there's a whole universe of it in TNOTB), so I'm not familiar with what's at its south pole. Assuming Oz is spheroidal?
Also, Glinda puts Cthulhu back to sleep. Eventually, after hijinks.
> >> > In fact, the mistake of the original poster consisted *of* unwisely
> >> > "putting cardinal directions on the map" by applying the directions that
> >> > would be in effect in the area of the map directly north of the South
> >> > Pole to the map as a whole
>
> >> In this map if you sail S towards the pole, which was the direction the
> >> ships in the story are traveling, then Victoria Land is to the right. If
> >> you continue in that direction you hit the 90 degree E line of longitude.
> >> If you go left you end up at 90 degrees W.
> >>
> >> Aha. I think everyone's right and that makes me wrong.
> >>
> >> The ships traveling south were at about 170E longitude. If you go right you
> >> end up at 90E longitude, that means you're traveling WEST.
> >>
> >> My bad. Actually my mistake was seeing 90E to the right and thinking aha
> >> that's going East. Abominable.
> >
> > IMO your mistake was in (apparently) assuming that a compass direction is
> > represented by a linear vector placed anywhere on the map, as long as it
> > aligns with an edge of the map, as in your usual equator-centered map.
I should have just said "Which way is East on the Discworld?
> And there's whole FIELDS
I saw what you did there.
> of higher mathematics concerned with tangent spaces
> and with transport of vectors along manifold surfaces that ordinary laymen
> never really see... but they have definite consequences in physics for gauge
> theories, for instance.
As you know, Dave, space itself might be handed:
http://www.mazepath.com/uncleal/qz4.htm
A truly unique possible way of breaking General relativity with Lots42 of nice (crosseyed) molecular stereograms.
WARNING: Uncle Al is not for the faint of heart.
> You can't comb a hairy sphere flat, to paraphrase one memorable result -
> there's no way to cover a sphere with locally parallel vectors tangent to it.
> There has to be at least one 'whorl'. Here, the North and South Poles are
> where the otherwise-locally-parallel east-west lines get into serious trouble
> and become singular...
I often wonder how many other species have cowlicks.
> (also, riddles about bear colors and explorers)
The titular "world" of Forward's _Dragon's Egg_ had, IIRC, one East pole and several West poles. Magnetic poles, but still.
Niven's Jinx has East and West poles.
His Ringworld (and his Brennan-monster's little playground) had no polar singularities.
> >> Also I only got JRRT, IMB, and MZB.
> >
> > I had trouble with ABC which really annoys me; he's one of my favorites.
>
> Did anyone say ERB yet? How about JKR?
Yes, and yes.
> Dave, ... LFB? LSMFT?
Hey, I've been watching TV long enough to recognize that last one from B&W cigarette ads!
(Well. I'm balding, but neither little nor wrinkled. So far.)
Mark L. Fergerson