ABSTRACT
The study of the planets in the ninth century reveals a new level of rationalization in astronomy compared to the previous three centuries. Basic spatial attributes like balance and symmetry come to be emphasized. There appear an increase in the amount of concrete information, a decrease in allegorical and symbolical references, and a greater organization of the information compiled. The uses of Pliny focus on four astronomical excerpts and diagrams for significant planetary phenomens. From a compilation ordered by Charlemagne in 809 these materials came to have wide use. Capella's text set forth eccentric and partially heliocentric orbits with an explicit mechanism for planetary anomalies. The integration of Pliny's and Capella's planetary information was a conscious project for many commentators on the latter. Isidore's texts were received differentially, preference being given to what was compatible with the new tendencies in theory or information collecting.
