The Shizi explains the two halves of the word for "universe" as all of space and all of time.
Tips
history
尸佼 (c. 390–330 BC) advised the Qin reformer 商鞅 and fled to Shu after Shang Yang was executed in 338 BC. His book of twenty chapters was lost by the Song; what survives are passages quoted in other books, gathered by Qing scholars.
culture
It gives the earliest known definition of 宇宙: 上下四方曰宇，往古来今曰宙, 'the four directions with above and below are called yu; all time past and present is called zhou'.
