For example, they used the hand measurement to measure distances, and even today many people, when they do not have a ruler or a tape measure, measure the width of the door with their hand or the length of the yard with steps.
The problem with this is obvious: all human beings do not have their feet or hands of the same size, that is, also a problem of measures
The most rare systems of measurement coexisted until the French Revolution, back in 1789. In this time of turmoil and great changes, the French, inflamed by their desire to change and order the world,
they decided that they had to found a rational and unique measurement system that was superior to all the others. While politicians dedicated themselves to sending their enemies to the guillotine, the National Assembly (French) entrusted in 1790 to the Academy of Sciences to create this new system. The new system had to:
After much thought, the scientists of the time agreed that the unit of measurement should have to do with the planet Earth. And he proposed: why not make the unit of longitude be ten millionth of a quarter of Earth's meridian ?.
WE LEARNED A LOT OF THANK YOU FRIEND FOR TEACHING US SOMETHING NEW TODAY
For a terrestrial meridian is the distance that goes from the North Pole to the South Pole and back to the North Pole, that is, a complete return to the planet through both poles.