Why is Li Cumpoz important to the history of French scientific writing?

Li Cumpoz (The Computus), written by Philippe de Thaon, is significant to the history of French scientific writing because it stands as one of the earliest works in the Anglo-Norman dialect. As a foundational text, it represents an early effort to convey technical and scientific knowledge in the vernacular, rather than in Latin, which was the standard language for such subjects at the time.1