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Message: <blockquote data-quote="WyoDuner" data-source="post: 162395" data-attributes="member: 14602">Samsonite, thanks for the nice comments.  I use Deep Sky Stacker (freeware) for stacking the images.  It identifies the stars and places them on top of each other.  As a result, it appears that the ground is actually rotating but the stars are static - you can see the blurred sections of the ground as a result.  I have to limit exposure time to about 20 seconds with to prevent the stars from looking too oval. Here is a 100% crop showing the oval shape of the stars due to the long exposure.[ATTACH=full]41081[/ATTACH]</blockquote>