Timbuktu, founded around 1100 as a commercial center for trade across the Sahara Desert, was also an important seat of Islamic learning from the 14th century onward. The libraries of Timbuktu contain many important manuscripts, in different styles of Arabic scripts, which were written and copied by Timbuktu’s scribes and scholars. These works constitute the city’s most famous and long-lasting contribution to Islamic and world civilization. This work (date unknown) explains mathematical calculations and their use in astronomy and astrology. The final portion of the manuscript is missing. Arabic manuscripts; Astrology; Astronomy; Islamic manuscripts; Seasons; Timbuktu manuscripts