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By the twelfth century, northern European scholars gradually embraced Arabicinnovations in science and technology. England naturally developed into asignificant centre of the new learning in western Europe. Hereford, andspecifically its cathedral school, played a particularly important role in thetransition of English scholarship to the new learning. Hereford cathedraldeveloped into a focal point for high-level scholarship, attracting numerousscholars from across the continent. Roger of Hereford stands out among hispeers as an enlightened scholar who made more practical use than most of thefull astronomical and astrological knowledge base available in England at thetime. A significant body of recent scholarship focuses on twelfth-centuryecclesiastical developments, including those relating to Roger of Hereford'sComputus. However, much less scholarly emphasis is placed on Roger'sastronomical calculations, particularly those which allowed him to establish animportant reference meridian at Hereford. Those aspects are the focus of thispaper.

Roger of Hereford: the twelfth-century astronomer who put Hereford on the map, literally