Sima Tan

Sima Tan (c. 165–110 BCE) was a Chinese astrologist, astronomer, and historian during the Western Han dynasty. His work Records of the Grand Historian was completed by his son Sima Qian, who is considered the founder of Chinese historiography.

Education & career
Sima Tan studied astronomy with Tang Du, the I Ching under Yang He, and Daoism under Master Huang.

He was appointed to the office of Court Astronomer at age 25 in 140 BCE, a position which he held until his death. Although Sima Tan began writing the Records of the Grand Historian (Shiji), he died before it was finished; it was completed by his son, Sima Qian.

An essay by Sima Tan has survived within the Records of the Grand Historian. In this essay within the larger work, Sima Tan describes six philosophical lineages or "schools" (家 jiā):
 * Confucianism (儒家 Rú jiā)
 * Daoism (道家 Dào jiā)
 * Legalism (法家 Fǎ jiā)
 * Mohism (墨家 Mò jiā)
 * School of Names (名家 Míng jiā)
 * School of Naturalists (陰陽家/阴阳家 Yīnyáng jiā) (central figure Zou Yan)

Using the concept of 'Jia' or 'family' in their Records of the Grand Historian, Sima Tan and Sima Qian invented the Yin-Yang, Fajia, Mingjia and Daojia. Together with Mohism and Confucianism, they compare their purported strengths and weaknesses in promotion of what they dub the Daojia or Dao-school, which comes to mean Daoism a century after Sima Qian's death. Their descriptions of the schools are all flawed, orbiting the 'empty' dao-school. They do not name anyone under them. Imperial Archivists Liu Xiang (77–6BCE) and Liu Xin placed the figures, using them as categories in the imperial library a hundred years after Sima Qians death. They become categories of texts in the Book of Han.

The year of Sima Tan's death (110 BCE) was the year of the great imperial sacrifice fengshan (zh:封禅) by Emperor Han Wudi, for which the emperor appointed another person to the rank of fangshi, bypassing Sima, probably causing him much consternation.