How did the ancient unit of length become modern?

Degree-that is, length-has existed since human life. Primitive man took cloth as an inch, palm as a ruler and elbow as a ruler. From the unified measurement of Qin Shihuang to the appearance of modern measurement technology today, the evolution of ancient degree system reflects the historical changes.

summer

1 ft = 10 inch (1 ft =24.9 cm)

business

1 foot = 10 inch, 1 inch = 10 minute (1 foot =3 1. 1 cm).

week

1 ft = 1 ft, 1 ft = 10 inch, 1 0 minute (1ft = 19.9 cm).

surname

1 reference = 10 foot, 1 foot = 1 0 inch, 1 inch = 10 minute (1 foot = 27

Han/Han/Chinese/human

1 reference = 10 foot, 1 foot = 1 0 inch, 1 inch = 10 minute (1 foot = 27

Xin Mang; Eastern Han Dynasty

1 reference = 10 foot, 1 foot = 1 0 inch, 1 inch = 10 minute (1 foot =23

Three Kingdoms

1 foot = 1 foot, 1 foot = 1 inch,1inch = 10 minute (1foot =24. 1 cm.

Western Jin Dynasty (265-3 17)

1 foot = 1 foot, 1 foot = 10 inch, 1 inch = 10 minute (1foot =23 cm).

Eastern Jin Dynasty (3 17-420)

1 foot = 1 foot, 1 foot = 10 inch, 1 inch = 10 minute (1foot = 24.5cm).

Sixteen countries

1 foot = 1 foot, 1 foot = 10 inch, 1 inch = 10 minute (1foot = 24.5cm).

Southern and Northern Dynasties

1 ft = 1 ft, 1 ft = 10 inch, 1 0 minute (1ft = 24.5cm; 1 ft =29.6 cm)

Sui dynasty

1 foot = 1 foot, 1 foot = 10 inch, 1 0 minute (earlier:1foot =29.6 cm; Late stage: 1 ft = 23.5cm)

Tang;

the Five Dynasties

1 ft = 1 ft, 1 ft = 10 inch, 1 0 minute (small scale:1ft = 31min. Bigfoot: 1 ft =36 cm)

Song dynasty; surname

1 foot = 1 foot, 1 foot = 10 inch, 1 inch = 10 minute (1foot =30.7 cm).

Yuan dynasty (1206- 1368)

1 foot = 1 foot, 1 foot = 10 inch, 1 inch = 10 minute (1foot =30.7 cm).

bright

1 foot = 1 foot, 1 foot = 10 inch, 1 0 minute (cutting ruler:1foot =34 cm; Geodetic scale: 1 ft =32.7 cm; Building scale: 1 ft =3 1. 1 cm)

clean

1 ft = 1 ft, 1 ft = 10 inch, 1 0 minute (cutting ruler:1ft = 35.5cm; Geodetic scale: 1 ft = 34.5cm; Building feet: 1 foot =32 cm)

Modern Times

1 foot = 1 foot, 1 foot = 10 inch, 1 inch = 10 minute (1foot =33.33 cm).

One hectare equals 15 mu, one mu equals 60 abbots, fifteen mu equals one mu, and one mu is about 667 square meters.

Six feet is a step and a hundred steps is a step. Qin Tian's 240 steps are awkward. Or from ten years. -"Shuo Wen". The word is also used as "qi", "qi", "eye" and "qi". Such as: mu system (the system of dividing and calculating land area by mu); Mu grade (field soil quality grade); Mu of land (area per mu)