What parts of the human body can be used as

Various rulers of the human body

In the distant ancient Egyptian times, people had used some parts of the human body as rulers to measure length. At that time, some people used the middle finger to measure a person's length, thinking that the length of a fit person should be 19 times the length of the middle finger. The length of the arm of the ancient Egyptian pharaoh, that is, the distance from the elbow to the end of the middle finger, was called the "cubit" and became the basic unit of length at that time. The world-famous Great Pyramid of Khufu was built using Pharaoh Khufu's "cubit" as the standard. This steep and spectacular Great Pyramid is 300 cubits high, which is equal to 147 meters. It can be seen that the cubit of Pharaoh Khufu is 49 centimeters.

European monarchs in the Middle Ages also used the human body as a ruler to formulate new units of length. At the end of the 8th century, Charles I of the Roman Empire stipulated that his foot length should be 1 "foot". After this unit of measurement was introduced to the United Kingdom, the British authorities modified it, and the length of 36 full grains of wheat arranged was 1 "foot". A double is a foot, and 1 foot is equal to 0.3048 meters. In the 10th century, King Edgar of England had an idea and set the distance between his thumb joints to 1 inch. 1 inch is 2.54 centimeters. This monarch was ingenious and came up with the unit of length "yard". He defined the distance from the tip of his nose to the end of the middle finger of his outstretched arm—91 centimeters—as one yard. By 1101, Henry I legally recognized this unit of measurement. Since then, the "yard" has become the main unit of length in Britain and has been used for more than a thousand years.

In ancient my country, the human body rulers also played many roles. Emperor Taizong Li Shimin of the Tang Dynasty defined his double step, that is, one step with his left and right feet, as the unit of length "step"; he also defined one-fifth of a step as one foot and 300 steps as one mile. According to research, one step in the Tang Dynasty was 1.514 meters, and one Tang Li was equivalent to 454.2 meters. Ancient Chinese medicine often used the middle section of the middle finger of the hand to be 1 cun, which is still used in today's acupuncture treatment.

Not static

The rulers of the human body are not static. Take the head for example. The length of a one or two-year-old child is equal to 4 heads. When five or six years old, it is 5 heads. When 10 years old, it is 6 heads. When 16 years old, it is 7 heads. Long.

In different regions, the usage of human body rulers is different. In most parts of Asia and Africa, human length is 7.5 heads, while Western Europe, Northern Europe, the United States, and Canada use 8 heads as the standard for body length. This is because different races have different size ratios: Generally speaking, white people have short upper limbs and medium-length upper and lower limbs; black people have long limbs and short upper bodies. Compared with foreigners, Chinese people have larger heads, longer upper bodies, and shorter limbs.