The units used in the world of the book
Translator: 549690339
Because General Antoine-Laurent forcefully overcame opposing views to have the official adoption of "the distance of one forty-millionth of the planet's circumference as one meter" and "the mass of one cubic centimeter of water as one gram" as the standard units, and adopted the decimal system. And the calculation of the planet's circumference was completed by the Ancient Empire's mathematician Eratosthenes; two thousand years ago, he realized that the planet he lived on was spherical and derived the Earth's circumference in the Ancient Empire's units of length. By conversion, the specific length of one meter could be obtained from the Ancient Empire's units of length. However, since the definitions of the metric units were adjusted many times later on, the meter in this era and the meter in later generations are not exactly the same length, although approximately equal.
Therefore, in the protagonist's era, his country had already primarily used the "metric units" of centimeters, meters, kilometers, and grams, kilograms, tons. The definition of "second" was one eighty-six thousand four hundredth of a day, which was a unit from the past and not an original creation by General Antoine-Laurent.
Only in some remote areas and among some old people accustomed to the traditional practices were the old measurement units still used, and in the military, some practices of using the old measurement units were still retained. While other countries and regions did not use the metric system, each country and region had their unique measurement units.