Zhoubi Suanjing

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Zhoubi Suanjing
Hanyu Pinyin
Suànjīng
Wade–GilesSuan-ching

The Zhoubi Suanjing, also known by

Eastern Han
(25–220 AD), with some additions and commentaries continuing to be added for several more centuries.

Names

The work's original title was simply the Zhoubi: the character

thighbone but in context only refers to one or more gnomons, large sticks whose shadows were used for Chinese calendrical and astronomical calculations.[1] Because of the ambiguous nature of the character , it has been alternately understood and translated as 'On the gnomon and the circular paths of Heaven',[1] the 'Zhou shadow gauge manual',[2] the 'Gnomon of the Zhou sundial',[3] and 'Gnomon of the Zhou dynasty'.[4] The honorific Suanjing—'Arithmetical classic',[5] 'Sacred book of arithmetic',[6] 'Mathematical canon',[4] 'Classic of computations',[7]
—was added later.

Dating

Examples of the

Eastern Han, during the 1st or 2nd century. The earliest known mention of the text is from a memorial dedicated to the astronomer Cai Yong in 178 AD.[9] It does not appear at all in the Book of Han's account of calendrical, astronomical, and mathematical works, although Joseph Needham allows that this may have been from its current contents having previously been provided in several different works listed in the Han history which are otherwise unknown.[1]

Contents

tomb of Qin Shi Huang
(2006)

The Zhoubi is an anonymous collection of 246 problems[dubious ] encountered by the Duke of Zhou and figures in his court, including the astrologer Shang Gao. Each problem includes an answer and a corresponding arithmetic algorithm.

It is an important source on early

solar declination in the Northern Hemisphere at various points throughout the year.[1]

At one point during its discussion of the shadows cast by gnomons, the work presents a form of the

3-4-5 triangle,[17] whence it can be generalized to all right triangles. The original text being ambiguous on its own, there is disagreement as to whether this proof was established by Zhao or merely represented an illustration of a previously understood concept earlier than Pythagoras.[18][14] Shang Gao concludes the gougu problem saying "He who understands the earth is a wise man, and he who understands the heavens is a sage. Knowledge is derived from the shadow [straight line], and the shadow is derived from the gnomon [right angle]. The combination of the gnomon with numbers is what guides and rules the ten thousand things."[19]

Commentaries

The Zhoubi has had a prominent place in Chinese mathematics and was the subject of specific commentaries by Zhao Shuang in the 3rd century, Liu Hui in 263, by Zu Gengzhi in the early 6th century, Li Chunfeng in the 7th century, and Yang Hui in 1270.

Translation

A translation to English was published in 1996 by Christopher Cullen, through the Cambridge University Press, entitled Astronomy and mathematics in ancient China: the Zhou bi suan jing.[20] The work includes a preface attributed to Zhao Shuang, as well as his discussions and diagrams for the gougu theorem, the height of the sun, the seven heng and his gnomon shadow table, restored.

See also

References

Citations

  1. ^ a b c d e Needham & al. (1959), p. 19.
  2. ^ a b Zou (2011), p. 104.
  3. ^ Pang-White (2018), p. 464.
  4. ^ a b Cullen (2018), p. 758.
  5. ^ Needham & al. (1959), p. 815.
  6. ^ Davis & al. (1995), p. 28.
  7. ^ Elman (2015), p. 240.
  8. ^ a b Needham & al. (1959), p. 20.
  9. ^ Patrick Morgan, Daniel (2 November 2018). "A Radical Proposition on the Origins of the Received Mathematical Classic The Gnomon of Zhou (Zhoubi 周髀)". The Second International Conference on History of Mathematics and Astronomy: 4. Retrieved 25 December 2023.
  10. ^ Tseng (2011), pp. 45–49.
  11. ^ Ding (2020), p. 172.
  12. ^ Tseng (2011), p. 50.
  13. ^ Tseng (2011), p. 51.
  14. ^ a b Cullen (1996), p. 82.
  15. ^ Gamwell (2016), p. 39.
  16. ^ Cullen (1996), p. 208.
  17. ^ Chemla (2005), p. [page needed].
  18. ^ Chemla (2005).
  19. ^ Gamwell (2016), p. 41.
  20. .

Works cited

Further reading