¹ Crombie, A. C.; Robert Grosseteste and the Origins of Experimental Science, 1100 - 1700; Oxford, 1953.

² The reason might be that both men wrote commentaries on the Almagest.

³ See: al-Bīrūnī: The Book of Instruction in the Elements of the Art of Astrology; transl. by R. Ramsay Wright; London, 1934; Preface, II.

⁴ Ibn al-Haytham was born in 965 A.D.; cf. E. Wiedemann: "Ibn al-Haitam, ein arabischer Gelehrter"; in: Festschrift J. Rosenthal; Leipzig, 1906; p. 151.

⁵ 1bid, p. 157 (My own translation).

⁶ Ibid, p. 156 f

⁷ S. Pines: "Ibn al-Haytham's Critique of Ptolemy"; in: Actes du Xe Congres internationale d'histoire des sciences; Ithaca, 1962 (Paris, 1964), I., p. 547 f.

⁸ E. Wiedemann: "Ibn al Haitam, ein arabischer Gelehrter"; op. cit., p. 165.

⁹ Cf. E. Wiedemanm: Theorie des Regenbogens von Ibn al Hatam; in: Aufsatze zur arabischen Wissenschaflsgeschichte; Hildesheim—New York, 1970; Bd. H, p. 71.

¹⁰ Ibn al-Haytham: M (or Qawl) f al-Daw; nr. 2 in: Majmu' al-Rasa'il; Hyderabad, 1357 A.H. (1938); p. 2 (My own...