I have about 300 images from the various sky surveys that
I've downloaded as .fits files from:

http://archive.stsci.edu/cgi-bin/dss_plate_finder

Most of these display just fine in Guide 8. A small number of them,
however, are skewed or rotated about the center slightly so that
cataloged stars do not register with those in the images. I've
examined the headers, but there are so many parameters, I'm not
sure what to look for.

Anyone have any suggestions?

Thanks,

Bob