Dati's Globe (La sfera)

_La sfera_ (_The Globe_), written by the Florentine merchant, Goro Dati, is a curious textbook in poetic form—ottava rima, rhyming stanzas of 8 lines each—designed to introduce the next generation of Florentine merchants to natural phenomena, navigation, and the topography of the Mediterranean. The four books of _La Sfera_ discuss various topics on the Earth, the heavens, and their creation, as well as the ways in which they are connected. Book I explains the globe, cosmology, astrology, and natural phenomena. Book II discusses larger-scale natural phenomena such as the four elements, weather, seasons, and the four humors. Book III explains the winds and depicts nautical charts as well as navigation systems. Book IV completes the work with an itinerary of and maps major Mediterranean and Black Sea ports and is the primary source of the locations in the Gazetteer.