title: Sima Qian
context: Sima Qian was born at Xiayang in Zuopingyi (near modern Hancheng, Shaanxi Province) around 145BC, though some sources give his birth year as around 135BC.[3] Around 136BC, his father, Sima Tan, received an appointment to the relatively low-ranking position of "grand historian" (tàishǐ 太史, alt. "grand scribe" or "grand astrologer").[4][5] The grand historian's primary duty was to formulate the yearly calendar, identifying which days were ritually auspicious or inauspicious, and present it to the emperor prior to New Year's Day.[5] Besides these duties, the grand historian was also to travel with the emperor for important rituals and to record the daily events both at the court and within the country.[6] By his account, by the age of ten Sima was able to "read the old writings" and was considered to be a promising scholar.[6] Sima grew up in a Confucian environment, and Sima always regarded his historical work as an act of Confucian filial piety to his father.[6]
question: When was Sima Qian born?
answers.text: around 145BC