•
Iṣlāh Ḥarakāt an-Najūn () on the correction of earlier astronomical tables; •
Kitāb al-Qāsī (), 'Book of Minor'
Tabaqāt al-ʼUmam (Categories of Nations) The
Ṭabaqāt al-ʼUmam (
Tabaqāt) composed in 1068 is an early "history of science" that comprises biographies of the scientists and scientific achievements of eight nations. In the field of nations are the
Indians,
Persians,
Chaldeans,
Egyptians,
Greeks,
Byzantines,
Arabs and
Jews (in contrast to others not disposed, such as
Norsemen,
Chinese,
Africans,
Russians,
Alains and
Turks). Ṣāʿid offers an account of the individual contribution each nation makes to the various sciences of
arithmetic,
astronomy, and
medicine, etc., and of the earliest scientists and philosophers, from the Greeks,
Pythagoras,
Socrates,
Plato and
Aristotleto the Roman and Christian scholars of the 9th and 10th centuries in Baghdad. The second half of the book contains Arab-Islamic contributions to the fields of
logic, philosophy, geometry, the development of Ptolemaic astronomy, observational methods, calculations in
trigonometry and mathematics to determine the length of the year, the eccentricity of the Sun's orbit, and the construction of astronomical tables, etc. The
Ṭabaqāt al-ʼUmam has been transcribed and translated into many different languages in many periods and cultures. The original document is not extant and discrepancies in the translations creates problems for historians, including variations in the title of the book. Discrepancies in the content of the editions appear with some versions omitting words, sentences, paragraphs or entire sections. Some omissions or variations may have arisen through scribal error, or difficulties of direct translation, while others arose, perhaps deliberately, out of the political, religious, or nationalistic sensibilities of the translators. ==Notes==