Sima Qian's calendar was considered revolutionary, setting 365.25 days to a year, and 29.53 days to a month The planet 12620 is named Simaqian in his honour Sima thought the purpose of history was ...

With 97,000 members worldwide, the ICE exists to improve lives by ensuring the world has the engineering capacity and infrastructure systems it needs to enable our planet and our people to thrive. How ...