Ristoro or Restoro d'Arezzo was an Italian monk of the thirteenth century, author of the Composizione del Mondo[1] of c. 1282.
This is the first astronomical work to be written in Italian (Tuscan).[2] It contains also, as its title (The Composition of the World) suggests, geological theories: these covered the internal structure of a spherical shell Earth, fossils, and erosion, amongst others.
He observed a solar eclipse in 1239 and noted the exact time spend in totality.[3]
It has been claimed that Dante was familiar with Ristoro’s work.[2]. Dante in the Quaestio de Aqua et Terra dated to 1320 did consider related matters.[4]