Full Idea
Days, months, years and solstices have caused the invention of number, given us the notion of time, and caused us to inquire into the nature of the universe.
Gist of Idea
Heavenly movements gave us the idea of time, and caused us to inquire about the heavens
Source
Plato (Timaeus [c.362 BCE], 47a)
Book Reference
Plato: 'Timaeus and Critias', ed/tr. Lee,Desmond [Penguin 1971], p.65