10. Tha´bit-b-Mu´sa.

I can find no such name The Fihrist gives Thábit-b- Ahúsa, head of the Sabean sect in Harrán.

11. Muhammad-b-Ja´bir al Batta´ni. See p. 4, note 3.

12. Ahmad-b-'Abdu'llah Jaba´.

Jaba is a copyist's error for Habsh <Arabic> He was one of Al Mamún's astronomers, and distinguished by the title of Al Ḥásib or the Reckoner. He was employed by Mamún at Sinjar to observe the obliquity of the Ecliptic and to test the measurements of geometrical degrees. He compiled a set of tables by the Caliph's order. Ham. Purg. B. III, p. 260. Abu'l Faraj (ed. 1663, p. 247) says that he was the author of three Canons; the first modelled on the Sindhind, the second termed Mumtahan or Proven (after his return from his observations) and the third the Lesser Canon, known as the ‘Sháh’. He lived to the age of a hundred. Though Ham. Purg. writes the name Hubaysh (<Arabic>) and Habsh, the Fihrist and Sedillot confirm the latter reading. A list of this astronomer's works will be found in the last named work.

13. Abu´ Rayha´n.

Abu Rayḥán-Muḥammad-b-Aḥmad Albirúni, born 362. A. H. (A. D. 973), d. 440. (A. D. 1048). For further particulars I refer the reader to Sachau's preface to the Indica and the Chronology of this famous Savant.

14. Kha´lid-b-'Abdu'l Malik. See p. 4 note 1.

15. Yahya-b-Mansu´r.

More correctly Yahya-b-Abi Maṇsúr, was one of Al Mámún's most famous astronomers. Abu'l Faraj (p. 248). says that he was appointed by that Caliph to the Sham­másiyaḥ observatory at Baghdad and to that of Mount Ḳásiun at Damascus. The Fihrist gives a list of his works (p. 275) and (p. 143) his genealogy and descendants who appear to have shared and augmented their father's fame. He died about 833, (A. H. 218) in Mámún's expedition to Tarsus and was buried at Aleppo.

16. Ha´mid Marwaru´di.

This is doubtless, Abu Ḥámid, Aḥmad-b-Muḥammad as Ṣágháni. Ṣághán is a town near Marw. Ibn Khallikán's derivation of Marwarrúd will explain the difference in the titular adjectives of place. I transcribe De Slane. V. I, p. 50. “Marwarrúdi means native of Marwarrúd, a well-known city in Khorasán, built on a river, in Persian ar-rúd, and situated 40 parasangs from Marw as Sháhján; these are the two Marws so frequently mentioned by poets: the word Sháhján is added to the name of the larger one from which also is derived the relative adjective Marwazi; the word rúd is joined to that of the other city in order to distinguish between them. Marwarrúd has for relative adjective Marwarrúdi and Marwazi, also, according to as Samáni.” Sháhján is, of course, Ṣághán. Abu Ḥámid, was one of the first geometricians and astronomers of his time (d. 379. A. H. 989), and a maker of astrolabes at Baghdad and was employed to certify the correctness of the royal astronomical reports. Ham Purg. B. V. 313.

17. Mughi´thi. Perhaps, Mughni <Arabic> tabulae astronomicae sufficientes, mentioned by Háji Khalífa, p. 568, Art. <Arabic>

18. Sharki. (Var. Sharfi.) probably Abu'l Ḳásim as Saraḳi (<Arabic>) of whom Casiri writes. 'Abûlcassam Alsaraki Aractensis (of Rakka), Astrologiæ judiciariæ et astronomiæ doctrina, uti etiam Tabularum et Spheræ peritia haud ignobilis, inter familiares atque intimos Saifeldaulati Ali-ben-Abdalla-ben Hamdan, per ea tempora Regis, habitus est, quibuscumque Sermones Academicos frequens conferebat (Saifeldau­latus Syriæ Rex, anno Egiræ 356 obiit. (Sedillot, p. xlviii.)

19. Abu'l Wafa´-Nu´rha´ni. An error for Búzjáni. Búzján is a small town in the Nisábúr district in the direction of Herát. He was born A. H. 328 (939) d. 388 (998). In his 20th year he settled in Irák. A list of his works will be found in the Fihrist, p. 283. Ham. Purg. B. V. 306. His Canon was termed “as Shámil.” His most important work was the Almagest, which contains the formulas of tangents and secants employed by Arab geometricians in the same manner as in trigonometrical calculations of the present day. In the time of Al Battáni, sines were substituted for chords. By the introduction of tangents he simplified and shortened the expression of circular ratios. His antici­pation of the discoveries of Tycho Brahe, may be seen in Sed. p. ix.

20.	The Ja´mi'. (Plura continens)	of Kyakúshyár.
21.	The Ba´li'gh. (Summum attingens)
22.	The 'Adhadi.

Kúshyár-b-Kenán al Ḥanbali. <Arabic> wrote three Canons, according to Háji Kḥalífa. Two were the Jámi' and the Sáli' (<Arabic>) (Báligh is however, confirmed by D'Herbelot art Zig). These works were on stellar computations, on almanacs, the motions of the heavenly bodies and their number, supported by geometrical proofs. His compendium (mujmal) summarises their contents (p. 564.) The Jámi' is again mentioned lower down as a work in 85 chapters applied by the author to rectify or elucidate the Persian era. He added to it a supplement in illustration of each chapter of the Jámi' entitled <Arabic> The third Canon is called simply <Arabic> translated into Persian by Md-b-'Umar-b-Abi Ṭálib at Tabrízi. This was probably dedicated te Adḥad 'ud Daulah Alp Arslan lord of Khorasan who had condescended to accept this title from his creature the feeble Káim bi amrí' lláh at Baghdad. Hence, I conjecture, the name Adḥadí.

23. Sulayma´n-b-Muhammad. Untraceable. This name does not occur in one of the MSS. of the Aín.

24. Abu Ha´mid Ansa´ri.

The only descendant of the Auṣárs that I can find among the astronomers is Ibn us Sháṭir. d. 777 A. H. (1375); the name was Aláu'ddin, patronymic not given. See Haj. Khal. pp. 557. 566. It is possible that the celebrated Abu Ḥámid al Ghazzáli may be meant.

25. Safai´h. Evidently the name of a Canon and not of its author.

26. Abu'l Farah Shira´zi.

27. Majmua´'. Apparently the name of a Canon mentioned by Háji Khalífa. auctore Ibn Shari'. (<Arabic>) collecta de astrologia judiciaria.

28. Mukhta´r <Arabic> auct. Shaikh Abu Manṣúr Sulaiman b. al Ḥusain-b-Bardowaih. Another work of the same name (Dilectus e libris electionis dierum, astrologicae) was composed by the physician Abu Naṣr Yaḥya b. Jarír at Takríti for Sadíd ud Daulah Abu'l Ghanáim Abdu'l Karím.

29. Abu´'l Hasan Tu´si. This name occurs in the Fihrist (p. 71) as that of a scholar learned in tribal history and poetry. A son of the same name is mentioned as a distinguished doctor, but there is no notice of his astronomical knowledge.

30. Ahmad-b-Isha´k Sarakhsi.

The name of Isḥáḳ does not occur in the genealogy of any Sarakhsi that I can dis­cover. The text probably refers to Aḥmad-b-Md. b. at Ṭayyib, the well known precep­tor of the Caliph al Muatadḥid by whom he was put to death in A. H. 286 (899) for revealing his pupil's confidences. D' Herb. states that he wrote on the <Greek> of Porphirius, and Albirúni (Chronology) mentions him as an astrologer and cites a prophecy of his where he speaks of the conjunction of Saturn and Mars in the sign of Cancer.

31. Ghara´ri. Probably Al Fazári. Abú Isḥáḳ Ibrahím-b-Ḥabíb the earliest maker of astrolabes among the Arabs, who was the author of a canon and several astronomical works. Fihrist, p. 273, date not given.

32. Al Ha´ru´ni.