Robertus Anglicus or Robert the Englishman was an English astronomer of the thirteenth century. He taught at the

University of Montpellier The University of Montpellier (french: Université de Montpellier) is a public university, public research university located in Montpellier, in south-east of France. Established in 1220, the University of Montpellier is one of the oldest univ ...

, and possibly also at Paris. He is known as the author of a 1271 commentary on the ''De Sphera Mundi'' of

Johannes de Sacrobosco Johannes de Sacrobosco, also written Ioannes de Sacro Bosco, later called John of Holywood or John of Holybush ( 1195 – 1256), was a scholar, monk, and astronomer who taught at the University of Paris. He wrote a short introduction to the Hi ...

. It includes a significant reference to the state of the art in the technology of

clockwork Clockwork refers to the inner workings of either mechanical devices called clocks and watches (where it is also called the movement) or other mechanisms that work similarly, using a series of gears driven by a spring or weight. A clockwork mec ...

.Timeline - Clocks
He is also the author of the paper "Astrolabii Canones", which provided important principles for measurement on spheres.

References

Notes

{{DEFAULTSORT:Robertus Anglicus Medieval English astronomers 13th-century English people