[Utah-astronomy] Eclipse: moving shadow?

I am working on processing some images from the Quarry Bend star party of the eclipse: https://picasaweb.google.com/lh/photo/PfMBXArypRaGS_8Yzq_tMbjs7i-NclWSB9dbXw... I'm surprised that when I align the stacked images on Spica, not only does the moon move right-to-left, as expected, it seems the earth's shadow moves left-to-right. Is that real? Why would that be?  n the image linked above you can see how the moons on the right lay over top of the shadowed portion of the next moon. I expected to see a nice earth-shaped shadow in the middle of the image once all the photos were aligned.  These were taken with my Nikon D7000 riding piggy back on my telescope (fork-mount on a wedge), 10 minutes apart. Dion