Thanks, guys.
I didn't compensate at all. Just a point and shoot camera sitting on the ground, propped up on the lens cap.
I think that there's less-visible star motion in some parts of the photos because I was taking them mostly to the north west, north, and northeast. From what I remember of astronomy, the perceivable rotation of the earth is less when you're looking at something along the axis, i.e. the north star.
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