Monthly report for December 1997 by Christian A. Hummel: I added code to CHAMELEON to compute astrometric delay corrections from (x,y,z) catseye motion vectors from INCHWORM. With help from A. Hajian, I completed a poster for the USNO display at the upcoming AAS meeting in Washington. Refereed (third version) of a paper for A&A. (Rejected it while asking that this paper not be sent to me ever again.) Prepared a photo release for the AAS meeting, as well as a poster.