Byrhtferth, an Anglo-Saxon monk at Ramsey Abbey, studied under Abbo of Fleury during his stay there. ‘Byrhtferth’s diagram’ is an illustration for his treatise on the computation of the date of Easter and other astrological and natural science topics.
It relates many of the ‘foursomes’ of natural science and theology (four ages of man, directions, humours, essences, winds, gospels, etc.) to show the unity of heaven and earth as well as the harmony and truth of scripture. His Manual (Enchiridion), a scientific textbook, is Byrhtferth’s best known work.
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