Endnote 36
Part II, §3, l. 30.  Alhabor; i.e. Sirius or the Dog-star, as is evident from the fact of its being represented by a dog's head on the Astrolabe; see also the table of stars marked on the Astrolabe (in MS. Camb. Univ. Lib. Ii. 3. 3, fol. 70, back), which gives the declination 15° S, the latitude 39° S, and places the star in Cancer.  It is also plainly described in the same table as being `in ore canis', so that it is difficult to resist the conclusion of the identity of Alhabor and Sirius.  Mr. Brae, following later copies that have different readings of the numbers employed, identifies Alhabor with Rigel or b Orionis.  This is impossible, from the fact that Rigel and Alhabor both occur in the diagrams and tables; see, for instance, Fig. 2.  It is true that Rigel was sometimes called Algebar, but Alhabor stands rather for the Arabic Al-'abur.  The Arabic name for the constellation Canis Major was Al-kalb al-akbar, `greater dog', as distinguished from Al-kalb al-asghar, or `lesser dog'; and the star a Canis Majoris was called Al-shi'ra al-'abur, the former of which terms represented the Greek seirioV (Sirius), whilst from the latter (al-'abur) we have our Alhabor.  See Ideler, Über den Ursprung und die Bedeutung der Sternnamen, pp. 237, 256.