Here is an interesting fact: Huihui-li is a Chinese translation of a Astronomical handbook with Tables in Farsi from the Islamic world. It was translated at the Islamic Astronomy Bureau in the Chinese Capital. during Kublai Khan’s time. Huihui-li was used in conjunction with the official Chines calendar for more than 300 years. Different versions of Huihui-li are recorded in the Chinese and Korean sources and were even studied by Japanese Astronomers of the time. There is also some evidence that Huihui-li was based on observations made at the Islamic Astronomy Bureau as a result of collaboration between Persian Muslim astronomers and Muslim and non-Muslim Chinese astronomers and thus may not be an exact translation.
Source: Highlights of Astronomy: As Presented at the Xxiiird General Assembly of the IAU, 1997 edited by J. Andersen