A peice of software called REGISTAR will to that as well. Basically you give the program 2 or more images and then it automatically looks at the stars in the images and rotates / resizes the images to fit together perfectly.
I've used REGISTAR once and thought that it was an excellent program. The downside is that there isn't a free version available and costs around 100USD.
Don't mix this program up with Registack they are not the same.
Ant
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