Station

Walcher of Malvern, also known as Walcher of Lorraine or Doctor Walcher, was the second Prior of Malvern, England, and a noted astrologer-astronomer and mathematician.

Walcher was from Lotharingia and arrived in England around 1091. Using an astrolabe to measure the time of several solar and lunar eclipses with an accuracy of about fifteen minutes for his early observations, he computed a set of tables giving the time of the new moons from 1036 through 1111, which were considered important for medical astrology. His later observations revealed significant errors in his tables, reflecting the limitations of early medieval astronomical theory.