Joseon dynasty (1392-1897), 19th century Of jujube (ziziphus jujuba) wood inscribed on the face with 24 concentric tiers representing the four cardinal directions, the eight trigrams used in Yijing divination, the 10 heavenly stems, the 12 earthly branches representing the Daoist guardians who protect the earth, and the 24 solar terms, the center inset with a compass needle, the reverse inscribed with a divination chart 11 3/4in (29.8cm) diameter