Celestia Forums

The straight answer is NO, since none of catalogs used contains information on the the galactic peak rotation speed (or 21cm line width) in tabulated form. I don't know about specialized respective catalogs containing >10000 - 20000 entries... Ok, that's unlucky. But you really only need velocity d...

Certainly not in one single catalog! What I do is to merge several professional, specialized catalogs together, correlate the galaxies and extract the needed distance and other information via PERL. Ok, do you have enough information in the catalogue s you're using to apply TF and the FP relations?...

t00fri wrote:c) Globular Cluster Luminosity Function (GCLF)

d) Planetary Nebula Luminosity Function (PNLF)

e) Photometric Distances

f) Cepheid Distances

Do you have enough information in the catalogue you're using to apply the Tully-Fischer and Fundamental Plane relations to get distance?

Do a gravitational lens could look like this? That lens appears to be stuck in a galaxy - is this to be a microlens (lensing by a star?). The thing about microlensing is that the image splitting (or the radius of significant distortion) is very small, only a few micro-arcseconds. I doubt that would...

Paolo wrote:Windows glutCelestia obtained with MINGW through DevC++ RUNS

Well done!

IHMO there are several specifications to be made, before we could go into implementing the wavefilter feature. Beside the will to do so, we haven't worked out anything formal. When thinking about the theme, some questions come into my mind, and I think without having fully answered these, we should...

0.5; 0; 1; 0 (I hope 0.5 eqals 180?° on the y axis) * old axis quad = new axis quat Isn't it just (0, v) where v is the camera's (normalised) sky vector? I don't think (0.5, <0,1,0>) can be correct; it isn't normalised. Also, I think 0.5 = cos(angle/2) so 0.5 corresponds to a rotation of 2*acos(0.5...

(Gerbil94, can you put in your profil something saying that you are a coder? just for info...) That would be misleading, because I have neither the time nor the inclination to get into Celestia's internals. Sorry. This is from the Perl scripts I wrote to do various jobs in my binary star work. Obvi...

Certainly, there is a quaternion class. Since all rotations in Celestia are realized via quaternions a thorough understanding --far beyond superficial WEBsite introductions-- is indeed essential. Remember: The example with quaternions came up via Christophe's "harmless" proposal that somebody might...

Great if true! I would /love/ to be surprised. I guess after 3 years in this forum I have a pretty good idea about most people's specific know hows in this context. Surprises can may be come from /new/ members like yourself, for example. I have in the past made minor suggestions, but that was prior...

I think you took my examples much too literally... Yes, I think I understand your points now after reading your reply. Thanks. Certainly I am aware of the intention. But my way of thinking, planning and approaching an aim has always been direct and most learn-effective. Hence this "contrived" line ...

Other similar or related programs are trying to catch up, both at the open source and the commercial front. Take 'Stellarium' for example or 'Kstars' (Linux KDE). Although these programs are still relatively young, one can smell already the inherent upcoming potential and professional level develop...