The Equatorie of the Planetis describes an instrument for calculating the positions of the planets. It was probably composed in 1393, and is remarkable for being written in English, not in Latin. It was found accidentally by the historian of science by Derek J. de solla Price in 1951. The writer was John Westwyk, a Benedictine monk of Tynemouth Priory and St Albans Abbey.
It is HERE in its entirety as a high resolution digital scan.