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

TL;DR

This paper explores Roger of Hereford's contributions to 12th-century astronomy, highlighting his practical use of astronomical knowledge to establish a key reference meridian in Hereford, reflecting the era's scientific advancements.

Contribution

The paper uncovers Roger of Hereford's specific astronomical calculations and their role in establishing a reference meridian, a less studied aspect of his scholarly work.

Findings

Roger's astronomical calculations enabled the establishment of a reference meridian.

His work exemplifies practical application of 12th-century astronomical knowledge.

The study highlights Hereford's significance as a medieval scientific center.

Abstract

By the twelfth century, northern European scholars gradually embraced Arabic innovations in science and technology. England naturally developed into a significant centre of the new learning in western Europe. Hereford, and specifically its cathedral school, played a particularly important role in the transition of English scholarship to the new learning. Hereford cathedral developed into a focal point for high-level scholarship, attracting numerous scholars from across the continent. Roger of Hereford stands out among his peers as an enlightened scholar who made more practical use than most of the full astronomical and astrological knowledge base available in England at the time. A significant body of recent scholarship focuses on twelfth-century ecclesiastical developments, including those relating to Roger of Hereford's Computus. However, much less scholarly emphasis is placed on Roger's astronomical calculations, particularly those which allowed him to establish an important reference meridian at Hereford. Those aspects are the focus of this paper.