Bodleian Library, MS. Digby 83

Opusculum de ratione spere,

An anonymous Latin compilation on astronomy, geography and astrology in four books, incorporating excerpts from Hyginus, Isidore, etc.;
with diagrams, maps, and drawings of constellations and Zodiac signs, English, mid 12th century.

α       ?      ©
fol 3.

feu/air = air/eau = eau/terre

27/18 = 18/12 = 12/8  =   3/2

feu : chaud & sec
air : chaud & humide
eau : froid & humide
terre : froid & sec
feu/air = air/eau = eau/terre
27/18 = 18/12 = 12/8 = 3/2