The book was thoroughly illustrated along with observations and descriptions of the stars, their positions, their magnitudes (brightness) and their color. His results set out constellation by constellation. For each constellation, he provided two drawings, one from the outside of a celestial globe, and the other from the inside
He has descriptions and pictures of what he called "A Little Cloud" which is actually the Andromeda Galaxy. He mentions it as lying before the mouth of a Big Fish, an Arabic constellation. This "cloud" was apparently commonly known to the Isfahan astronomers, very probably before 905 AD.
He probably also cataloged the Omicron Velorum star cluster as a "nebulous star", and an additional "nebulous object" in Vulpecula, a cluster now known as Al Sufi's or Brocchi's Cluster, or Collinder 399. Moreover, he mentions the Large Magellanic Cloud as Al Bakr, the White Ox, of the southern Arabs as it is invisible from Northern Arabia because of its southern latitude.
External Links
Books on Muslim Astronomy