why a clock have only12 hours?

Answer 1

the 24 hour day is based on a mathematical relationship regarding the rotation of the earth. (This is the same concept that can explain how and why radians and degrees are used in trig measurement.)

Clocks usually have 12 hours on them because this makes it easier to show the minutes and seconds in between each hour, as opposed to having 24 numbers. The angles make by the hands seem more defined in a 12 hour system than in a 24 hour system.

Telling time is a visual process, so the clearer the clock is...the faster and more efficient this will be.

Answer 2

definition

we define a second be a certain number of vibrations of a cesium atom

the original counting systems (babylon era) were all base 60, which went well into an hour. it's also a multiple of 12 (12x5=60)

we've got 3 joints on each finger (3x4=12) with 5 fingers a hand (again, 12x5=60)

We're not really sure why they chose 60, or why we use 10 (computers use 2 and 16 as bases) but that's the way the history of math was built.

Answer 3

No one knows why exactly, but the reason they are like that today is because ancient sundials and water clocks consisted of 12 hours. One of the theory's as to why that is, is because they had to equally divide the day into sections. I don't know why they chose 12 though.

Answer 4

Economy of space. Why crowd all those numbers when you can just have the hands go around twice. Obviously you know whether it's night or day.

Answer 5

And how should i know? Because if you put all 24 it will be too full and too hard to read!

Answer 6

WRONG SECTION

Answer 7

dunno... just imagine if we have 100 hours in a clock..