Start of Winter立冬

Sunrise

In Beijing, as the book records it, the sun rises 21°33′ south of due east.

Three pentads

Each term splits into three five-day pentads, each named for a sign in nature.

1. 1水始冰Water begins to freeze
2. 2地始凍Ground begins to harden
3. 3雉入大水為蜃Pheasants enter the water and become giant clams