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      1 DELAMBRE, Histoire de l’Astronomie ancienne, Tome I. Discours préliminaire, p. X.
      2 Ibid., Tome I, p. 325.
      3 Ibid., Tome II, p. 67.
      4 Journal des Savants, 1857, p. 10.
      5 Populare Astronomie, § 301.
      6 Rien ne prouve qu’Eudoxe fut géomètre. Questa enorme proposizione si trova enunciata presso DELAMBRE, Histoire de l’Astronomie ancienne. Tomo I, p. 131. Mostrerò più avanti in qual conto si debba tenere.
      7 BAILLY, Histoire de l’Astronomie ancienne, p. 242.
      8 MONTUCLA, Histoire des Mathématiques, Nouy. Édition, Tome I, pp. 182-183.
      9 HOEFER, Histoire de l’Astronomie. Paris, 1873, p. 136.
      10 DELAMBRE, Hist.de l’Astr. anc., T. I, p. X.
      11 WHEWELL, Geschichte der inductiven Wissenschaften, edizione tedesca di Littrow, vol. I, pp. 137-139.
      12 MAEDLER, Geschichte der Himmelskunde, Erster Band, p. 47. Braunschweig, 1873.
      13 SCHAUBACH, Ueber Eudoxus Vorstellung vom Planetensystem.Nelle Gotting.gelehrte Anzeigen del 1800, n. 54.
      14 SCHAUBACH, Geschichte der griechischen Astronomie bis auf Eratosthenes (Göttingen, 1802), pp. 433-442.
      15 IDELER, Ueber Eudoxus Mem. dell’Acc. di Berlino, Classe istorico-fllologica, anno 1828, pp. 189-212; anno 1830, pp. 49-88.
      16 CORNEWALL LEWIS, An historical Survey of the Astronomy of the Ancients. London, 1862, pp. 153-156.
      17 «It is difficult to understand how these co-revolving orbs were conceived to harmonize in producing a single resulting motion: but the Greeks, even in the time of Eudoxus, were subtle geometers, and they doubtless had formed a clear idea as to the solution of a problem which was substantially geometrical». An Historical Survey, etc, p. 153. E altrove: «The theory of composite spheres, devised by Eudoxus and developed by Callippus and Aristotle, was ingenious and required much geometrical resource». Ibid., p. 210.