[384] Primitive Constellations, vol. ii. p. 143.

[385] Recherches sur l’Histoire de l’Astronomie Ancienne, by Paul Tannery (1893), p. 298.

[386] Primitive Constellations, vol. ii. p. 225.

[387] Nature, October 2, 1890.

[388] Lalande’s Astronomie, vol. i. pp. 243-4.

[389] Lalande’s Astronomie, vol. i. pp. 242-3.

[390] There are three copies of Al-Sufi’s work in the Imperial Library at Paris, but these are inaccurate. There is also one in the British Museum Library, and another in the India Office Library; but these are imperfect, considerable portions of the original work being missing.

[391] Harvard Annals, vol. ix. p. 51.

[392] The science of the risings and settings of the stars was called ilm el-anwa (Caussin, Notices et Extraits des Manuscrits de la Bibliothèque due Roi, tome xii. p. 237).

[393] See Mr. E. B. Knobel’s papers on this subject in the Monthly Notices, R.A.S., for 1879 and 1884.