Title from explicit (f. 25v).
Collation: Paper, 28; 1¹⁰ 2¹² 3⁸(-2); [1-28], modern foliation in pencil, lower right recto.
Layout: Written in 25-29 long lines; frame-ruled in lead.
Script: Written in humanistic cursive script.
Decoration: 2 detailed pen-and-wash drawings of the astrolabe quadrant in black and red ink (use of quadrant to locate a
star, including position of astronomer's head, f. 4v-5r; back of quadrant, f. 5v); 2 small drawings of towers illustrating
measurement of height (f. 21v, 23v); a square diagram in black and red ink and wash illustrating the computation of the 12
houses of the horoscope for 14 Nov. 1501 (f. 16v); 1 large geometric diagram (f. 2v), 7 small geometric diagrams in margins
with measurements marked in red (f. 24v-25r); and 5 semicircular diagrams concerned with calculating time (f. 26r-26v). 9
tables in red and black (symbols and names for planets and zodiac signs, f. 4r; ascension of zodiac signs, f. 5r; fixed stars,
f. 5r; position of the sun, f. 6r; hours of day and night, f. 9v; hours of night at the 45th latitude, f. 10r; general ascension
of zodiac signs, f. 13v; ascension of zodiac signs at the 45th latitude, f. 14r-14v; sunrise and sunset at the 45th latitude,
f. 15r-15v). 8-line red initial on a square ground partially infilled with penwork (f. 2r); 2-line red initial on pen-and-wash
square ground (f. 13v); 1-line red initials in text for references to diagrams; rubrication and marginal chapter numerals
and notes in red. Spaces left open for 2- and 3-line initials at the beginning of each chapter rubric.
Watermark: Similar to Briquet Aigle 93 (Florence and Naples, 1529).
Binding: Bifolium from a 12th-century southern Italian manuscript of Augustine's In Iohannis evangelium tractatus (text in
2 columns, in the Bari type of Beneventan script, with majuscule initials highlighted in red or red and green).
Origin: Written in southern Italy, ca. 1502. The geographical location is supported by textual references to the island
of Diomedes (now Isole Tremiti), in Puglia, the binding from an earlier southern Italian manuscript, and the watermark similar
to one used in Naples later, but some tables in the text give astronomical information for the 45th latitude, which passes
through northern Italy. Dates in the text are 1501 (f. 16v, 19v) and 1502 (f. 6r).