BEA: 50 chapters on astrology and astronomy, timekeeping and an almanac. Intro to medieval astronomy that includes basic zodiacal and planetary astrology. Subjects: zodiac, course of sun and moon, planets, fixed stars, eclipses, astrolabe, lunar mansions, calendar systems, determination of the qibla, timekeeping (including tables); mentions Dorotheus and Kushyār b. Labbān; Ch. 32 almanac of seasonal reackoning c. 1271