Watermarks: Grapes with crown; eagle with initials GFA in roman. For the latter see Edward Heawood, Watermarks, Mainly of the 17th and 18th Centuries (Hilversum, 1950), nos. 1261 and 1262.Text and tables rubricated; foliation in hand of copyist; extensive notes and calculations in another hand inside covers and on flyleaves.Date in title on p. [1].Text (not this copy) published.Almost entirely tables for timekeeping, perhaps for Istanbul (latitude 41⁰)?; short sharḥ in Turkish on sine of horizon on p. [73]; cf. David A. King, A Survey of the Scientific Manuscripts in the Egyptian National Library (Winona Lake, 1986), p. 175.