The ratio of circumference to diameter is called pi, and the symbol is π. In ancient China, relatively accurate pi was obtained very early. According to China's ancient books Sui Shu's Law and Li Zhi, the true value of pi calculated by Zu Chongzhi in the Northern and Southern Dynasties was between 3. 14 15926 and 3. 14 15927.
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It is of little practical significance to calculate the value of pi so accurately. A dozen pi values used in modern science and technology are enough.
If the Hubble volume is calculated by using the 39-bit precision pi value, the error is less than the volume of an atom. In the past, people calculated pi to explore whether pi circulated decimals. Since Lambert proved that pi is irrational in 176 1 and Lin Deman proved that pi is transcendental in 1882, the mystery of pi has been uncovered.