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 now. www.yahoo7.com.au/worldsbestemail