The epistemic shift underlying the Scientific Revolution may be traced in parallel developments in the mapping of musical and physical space. Circular diagrams in music theory texts reveal the influence of spatial and temporal disciplines, including astronomy, chronometry, geography, and navigation. If these sister disciplines had always been tied to music through musica mundana, their influence on the mapping of tonal space only intensified in the early 17th century, exhibiting a concurrent shift from symbolic to empirical representations. Zarlino's circular illustration of the senario, for example, legitimates the syntonic diatonic scale; its circular organization has nothing to do with tonal circularity, but rather with graphical logic and rhetoric. In contrast, circles by René Descartes, Quirinus van Blankenburg (based on work by Christian Huygens) and Isaac Newton present logarithmic circular divisions of the scale—approaches made possible by recent innovations by Simon Stevin and John Napier.