He has been described as an important transitional figure, whose observations and writings reflected the transformation of the astronomy of the Latin West from its traditional focus on computing dates in the ecclesiastical calendar and studying the rudiments of Roman astronomy to the use of ancient astronomical computational methods learned from Arabic zijes and other Islamic sources.
[4] His later observations revealed significant errors in his tables,[5] reflecting the limitations of early medieval astronomical theory.
[8] In De Dracone, Walcher recorded angles in degrees, minutes, and seconds, although he wrote these numbers using Roman, rather than Arabic numerals.
Walcher's gravestone in St Anne's Chapel at the Priory Church records his abilities: Philosophus dignus, bonus astrologus lotharingus, Vir pius et humilis, monachus, prior hujus ovilis Hic jacet in cista geometricus et abacista, Doctor Walcherus; flet plebs, dolet undique clerus; Huic lux prima mori dedit Octobris seniori; Vivat ut in coelis exoret quisque fidelis.
"In this chest lies Doctor Walcher, a worthy philosopher, a good astronomer, a Lotharingian, a pious and humble man, a monk, the prior of his sheepfold, a geometer and abacist.