Number of Days
In the late Spring and Autumn Period (722–481 BC), the former Sifen calendar (古四分历) was established, and set the tropical year at 365.25 days, the same length as the Julian calendar which was introduced in 46 BC. The Taichu calendar (太初历) of 104 BC under Emperor Wu of Han rendered the tropical year at roughly the same (365 ).
Many other calendars were established between then and the Yuan Dynasty (1271–1368), including those established by Li Chunfeng (602–670) and Yi Xing (683–727). In 1281, the Yuan astronomer Guo Shoujing (1233–1316) fixed the calendar at 365.2425 days, the same as the Gregorian calendar established in 1582; this calendar, the Shoushi calendar (授時曆), would be used in China for the next 363 years. Guo Shoujing established the new calendar with the aid of his own achievements in spherical trigonometry, which he derived largely from the work of Shen Kuo (1031–1095) who established trigonometry in China.
Read more about this topic: Chinese Calendar
Famous quotes containing the words number of, number and/or days:
“It is always possible to bind together a considerable number of people in love, so long as there are other people left over to receive the manifestations of their aggression.”
—Sigmund Freud (1856–1939)
“It seems to me that there must be an ecological limit to the number of paper pushers the earth can sustain, and that human civilization will collapse when the number of, say, tax lawyers exceeds the world’s total population of farmers, weavers, fisherpersons, and pediatric nurses.”
—Barbara Ehrenreich (b. 1941)
“Holly Golightly: You know those days when you’ve got the mean reds?
Paul: The mean reds? You mean like the blues?
Holly Golightly: No, the blues are because you’re getting fat or maybe it’s been raining too long. You’re just sad, that’s all. The mean reds are horrible. Suddenly you’re afraid and you don’t know what you’re afraid of.”
—George Axelrod (b. 1922)