At the end of the last century Paul Tannery published an article on geometry in eleventh-century Europe, which he began with the following statement:“This is not a chapter in the history of science; it is a study of ignorance, in a period immediately before the introduction into the West of Arab mathematics.”.

The “Scientific Revolution” of the seventeenth century cannot adequately be assessed without an appreciation of the achievements and limitations of those, whether giants or dwarfs, on whose shoulders Galileo and his contemporaries stood. And since for many historians Galileo's main contribution lies in the mathematization of the natural world and especially of time and motion, particular interest attaches to medieval treatises dealing with these questions, above all to those which were in widespread demand early in the sixteenth century.

This chapter focuses on one of the common fallacies in Western philosophy: chronological snobbery (CS). First described by the Christian academic Owen Barfield in the 1920s and later popularized by his friend and colleague C.S. Lewis, the fallacy of CS presupposes that cultural, philosophical, or scientific ideas from later time periods are necessarily superior to those from earlier ages. Grounded on the Enlightenment's concept of “progress”, this informal fallacy stems from the assumption that the ever‐increasing amount of knowledge in society (...) naturally and perpetually replaces all outdated, disproven ideas with updated, better‐justified beliefs, therefore making old ideas incorrect or irrelevant simply because they are old. Essentially the opposite of the appeal to ancient authority, CS relates to guilt by association, hasty generalization, and poisoning the well fallacies whenever it references unrelated false beliefs held by individuals from the originating time period. (shrink)