I often forget these “common sense” measurements. Along with the ‘hour.’ No metric equivalent for minutes and seconds? Why not? How about longitude and latitude?
To a some degree, the drive to “metrification” was powered by the usual suspects - academia, MSM, liberals, etc. In other words, the smart people who know oh so much more than those of us out here in the real world.
(For the most part, people in labs who wanted to work in metric measurements, didn’t really care to force the rest of us to follow suit. What a nice tolerant conservative trait.)
Babylonian geometry and the concept that a chord equal to the radius of a circle can fill said circle with six equilateral triangles. By dividing those further, you end up with 360 isosceles triangles defining degrees of arc, which conveniently approximates the number of days in a year.
And why are there 24 hours in a day?! Can't we have a 10 hour day?