Abstract

This chapter is about the movement of sunlight and the concept of time in Timaeus’ cosmology in Plato’s Timaeus. It argues for three connected theses: (i) that light is a grounding principle of his account; (ii) that Timaeus puts forward a proposal for the calculation of a cosmic calendar, i.e., the counting of time according to the movement of sunlight throughout the whole world; and (iii) that he understands time (chronos) as the movement of all heavenly bodies relative to the motion of light streaming from the sun.