[geocentrism] Re: Erratum: Great circles
- From: Paul Deema <paul_deema@xxxxxxxxxxx>
- To: geocentrism@xxxxxxxxxxxxx
- Date: Thu, 22 Nov 2007 11:53:45 +0000 (GMT)
Regner T
Thanks for that -- I'm relieved that I don't have to re-educate myself!
I'll sneak a side comment in here -- impressive graphics Ani.1 and Ani.2. Also
comforting -- again I don't have to relearn anything! How long can this streak
of good fortune continue?
Paul D
----- Original Message ----
From: Regner Trampedach <art@xxxxxxxxxx>
To: geocentrism@xxxxxxxxxxxxx
Sent: Wednesday, 21 November, 2007 10:07:57 PM
Subject: [geocentrism] Re: Erratum: Great circles
As Paul Deema pointed out below, I have used the term "great circles"
for something different. I stay corrected. Thanks, Paul for telling me.
Any longitude circles, e.g., the meridian, and the equator are all great
circles.
I have used the term in a few recent posts, and it should just be
substituted for "circles of constant latitude", w.r.t. what-ever axis
I am talking about there. It doesn't affect my arguments or conclusions,
but the correction hopefully makes those clearer.
Regards,
Regner
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Quoting Paul Deema <paul_deema@xxxxxxxxxxx>:
> Regner T
>
> Thank you for that but it still leaves me with a problem. Here is the
> definition I'm working with -
> http://www.phys-astro.sonoma.edu/courses/a231/some_definitions.html
> Great Circle -- a circle on the surface of a sphere (thus on the surface of
> the earth or the celestial sphere) which is formed as the result of the
> inter-section of the sphere and a plane passing through the center of the
> sphere.
> Since a circle of constant latitude does not pass through the centre of the
> sphere (except for the equator) there is a problem of definition here
> somewhere.
> Paul D
>
>
>
> ----- Original Message ----
> From: Regner Trampedach <art@xxxxxxxxxx>
> To: geocentrism@xxxxxxxxxxxxx
> Sent: Wednesday, 21 November, 2007 12:27:31 AM
> Subject: [geocentrism] Re: 2 Axes of rotation - drawing brand new for you
>
> Paul,
> Your question is not pedantic, and having the terminology correct and
> understood is crucial for any discussion. Thanks for asking.
> "great circles around the celestial poles" means exactly what you suggest:
> "parallels of celestial latitude" = "circles of constant celestial latitude".
> These are the same as the nightly star-trails.
>
> Regards,
>
> Regner
>
> P.S. Sorry about the link, it should have been:
> //www.freelists.org/archives/geocentrism/11-2007/pnglDPGTqO13P.png
>
> ----------------------------------------------------------------------------
> Quoting Paul Deema <paul_deema@xxxxxxxxxxx>:
>
> > Regner T
> > I assure you that I am not being a pedant but I have to raise another point
> > with you. It concerns this para -
> > It is also clear that if the camera is mounted at another angle (still
> > fixed) the camera will point at great circles around the celestial poles,
> > both during the day and during the year (taking pictures every [tropical]
> > solar day).
> >
> > I have a problem with your usage of 'great circles'. Do you mean 'parallels
> > of celestial latitude'? As I say, pedantry for its own sake, is petty. I
> ask
> > because my knowledge is -- in the great scheme of things -- sketchy, and
> when
> > confronted with something which conflicts with that present knowledge, I
> > suffer the symptoms of analogously having the ground move under my feet. So
> > basically -- do I have to learn something new?
> > Paul D
> > PS I didn't have the password for vateco!
> >
> >
> > ----- Original Message ----
> > From: Regner Trampedach <art@xxxxxxxxxx>
> > To: geocentrism@xxxxxxxxxxxxx
> > Sent: Tuesday, 20 November, 2007 3:49:17 PM
> > Subject: [geocentrism] Re: 2 Axes of rotation - drawing brand new for you
> .....
> http://vatceo.phys.au.dk/horde/imp/message.php?index=7668
> .....
> > Regner
>
>
> Make the switch to the world's best email. Get the new Yahoo!7 Mail
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>
>
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