Note 1133 — Chapter III
W. (William) Falconer translation
Probably a celestial globe constructed by Billarus, or on the principles of Billarus, a person otherwise unknown. Strabo mentions, b. ii. c. v. § 10, the Sphere of Crates, Cicero the Sphere of Archimedes and of Posidonius. History speaks of several of these spheres, among others of that of Ptolemy and Aratus. Leontinus, a mechanician of the sixth century, explains the manner in which this last was constructed.