Summary:

Gerard of Cremona (Latin: Gerardus Cremonensis; c. 1114 – 1187) was an Italian translator of scientific books from Arabic into Latin. This is a short tract covering the twelve houses of astrology. Not really knowing about these things, I'm not sure why the title mentions Astronomy and the contents, Astrology, but there you go. I'm sure people who understand this sort of thing will get it though.