Watermark: Andrea Galvani of Pordenone (f. 1 only). See Edward Heawood, Watermarks, Mainly of the 17th and 18th Centuries (Hilversum, 1950), p. 36 and no. 860.Contains astronomical and mathematical tables and geometric diagrams.Text rubricated; marginal corrections and notes in hand of copyist and others; some pp. missing, f. 1 supplied in different paper in different hand."Extended commentary with some tables" on author's Qalāʾid al-laʾālī fī ʻamal al-ayyām wa-al-layālī, "a poem on timekeeping in unnumbered faṣls." David A. King, A Survey of the Scientific Manuscripts in the Egyptian National Library (Winona Lake, 1986), p. 104.