The earliest reference found to the moment is from the 8th century writings of the Venerable Bede,[5] who describes the system as 1 solar hour = 4 points = 5 lunar points[6][7] = 10 minutes = 15 parts = 40 moments. Bede was referenced five centuries later by both Bartholomeus Anglicus in his early encyclopedia De Proprietatibus Rerum (On the Properties of Things),[8] as well as Roger Bacon,[7] by which time the moment was further subdivided into 12 ounces of 47 atoms each, although no such divisions could ever have been used in observation with equipment in use at the time.