Note 287 — NO. II ALMAGEST; BOOK II. EXTRACT FROM CHAP. IX

Thus, the aggregate times of ascension, in a right sphere, of the first point of Gemini are 57° 44′; and, in the climate of Lower Ægypt, 45° 5′: the sixth part of the difference between them is 2° 6′ and a fraction, which, added to 15°, again makes the diurnal temporal hour of the first point of Gemini equal to 17° 6′ and a fraction of the equator. In the climate of Southern Britain, the aggregate times of ascension of the first point of Gemini are 29° 43′: the sixth part of the difference between that sum and 57° 44′ of right ascension is 4° 40′ and a fraction, which, added to 15°, makes the diurnal temporal hour of the first point of Gemini, in South Britain, equal to 19° 40′ and a fraction of the equator, as before shown.