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Thanks Carlos!
Vivek - the theory is easy. You set one image as your base layer, then find each frame with a meteor in it, overlay the image, and rotate until the stars line up. Then your meteor will be placed correctly, relative to the stars.
How you do it in practice is another issue. I did it manually in Photoshop, setting the blend layer to "difference" and manually lining up the stars. The rotation is hard this way unless you can see the SCP in your image, which I couldn't. In that sense I did quite a rough job, but you can see it worked out fine.
A better way would be to use some alignment software that is used to stack images, or Colin has suggested ways to do it using stabilising routines in After Effects - but in any case the idea is the same.
Geoff
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