Ma Yize

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Ma Yize (

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Career and works

In the early 10th century, the Chinese emperor of the Song dynasty encouraged the advancement of the study of astronomy and its related disciplines. In 961, the Emperor Taizu (r. 960-976) appointed Ma Yize (910?-1005) as the chief official to take charge of the government observatory.

Ma Yize assisted Wang Chuna in compiling several important astrological works, including the Yingtianli (Calendar of Corresponding Heavens). His job was to provide observation, and computation of the regularities in celestial phenomena, using the Islamic methods. His findings were used by Wang Chuna in the compilation of Yingtianli, which was completed in 963. The calculation, based on a 7-day week system similar to that in the Islamic calendar, was first adopted in this document, which was the most important occurrence in the Chinese history of calendrical methods.

Ma Yize might have consulted many works of Islamic mathematical astronomy into Chinese, including:

• Kitab al-Zij [Al-Battani sive Albatenni Opus astronomicum], 880, by Abu'Abdallah al-Battani [Latin: Albategni or Albatenius], 858-929
• al-Zij al-sabi [The Sabian Tables]
• Kitab Matali' al-Buruj [On the Ascensions of the Signs of the Zodiac]
• Kitab Aqdar al- Ittisalat [On the Quantities of the Astrological Applications]

It is possible that Ma was influenced by Al-Battani and Al-Hamdani. Owing to Ma's contribution to the compilation of 'Yingtianli', Ma was made a hereditary noble and his sons later succeeded his position with the Imperial Observatory.