Re: [gentoo-user] a star-map wallpaper?

[Willie Wong]

On Wed, Jun 14, 2006 at 05:30:04PM +0800, Penguin Lover ??? ?????? squawked:
> Hello. Sorry for my English if there is a more correct way of saying "Star
> map". By Star Map I mean something that shows the position of starts, as
> well as brightness. The more like photo, the better.

The word you are looking for is 'chart', as in 'star chart'. Google
for 'star chart wallpaper linux' or some phrase like that. 

> Star moves in the sky all the time:
> 1) the star map in 20:00 is different from 21:00
> 2) the star map in today 20:00 is different from what it was yesterday 20:00
> 3) the star map in one city is different from in another city at the same
> time
>
> I am looking for an application dynamically change the backgroup of my gnome
> desktop, showing the correct starmap of the very city I am in, of the very
> day and correct moment. That might require the desktop image being replaced
> once 15 miniutes, that doesn't matter, that's what I need.

I don't know if any program of your specification is available, but
for KDE at least you can run a graphic program in the root window and
use that as a desktop image, thought I don't know about gnome. 
 
Try looking at some of the following to see if you can at least use it
to meet your needs:
  xephem:  http://www.clearskyinstitute.com/xephem/
  pp3: http://pp3.sourceforge.net/
  kstars (yes, I know you are running gnome):
       http://edu.kde.org/kstars/
  Mag 7 star charts: http://www.cloudynights.com/item.php?item_id=1052

If you don't care too much about accuracy, some elementary mathematics
plus the Mag 7 star charts, a cron job, and an image viewer with
ability to set the background image (like qiv or xli) should allow you
to dynamically switch the background image to the roughly correct star
chart. 

W
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