If you want to get a view of Atlantis in its final journey then skywatchers across US will get a fine opportunity to watch this weekend. Both shuttle and space station will be visible as separatte entities as shining "stars" on Friday and Saturday evening.By Sunday evening, Atlantis will be docked to the ISS, and both will appear as a single bright moving "star."
Atlantis and ISS will be visible across parts of southern Canada and most of the 48 continental United States.
If you live in US and want to know viewing schedule for your particular hometown then you can easily find out by searching for one of these four popular Web sites: Chris Peat's Heavens Above, Science@NASA's J-Pass, NASA's SkyWatch and Spaceweather.com or by logging into this site.
Source : space.com.