Lukisan roh pelindung Tiongkok pada ubin dari Dinasti Han (202 SM—220 M) yang mewakili pukul 11 malam hingga 1 pagi (kiri) dan 5 pagi hingga 7 pagi (kanan); bangsa Tiongkok kuno, meskipun membahasnya dalam konteks supernatural, mengakui ritme sirkadian dalam tubuh manusia
Teorema sisa Tiongkok: Teorema sisa Tiongkok, termasuk kekongruenan secara simultan dalam teori bilangan, pertama kali diciptakan pada abad ke-3 M dalam buku matematika Sunzi Suanjing mengemukakan masalah: "Ada suatu bilangan yang tidak diketahui, ketika dibagi dengan 3 ia bersisa 2, ketika dibagi dengan 5 ia bersisa 3, dan ketika dibagi dengan 7 ia bersisa 2. Temukan bilangan tersebut."[1]
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