>>213587982>60 seconds in a minute>60 minutes in an hourAncient greek mathematics measured a circle in 360 degrees, clocks are round and have an hour hand and a minute hand, 60 divides nicely into 360, therefore a quarter of a second/hour is a quarter of the way through the rotation of the minute/hour hand.
> 24 hours in a day>365 days in a year24 is a multiple of 6 just as 60 and 360 are, meaning one hour of a 24 hour day is 1/12th rotation of the hour hand, 24 hours of a full day are two rotations of the hour hand, meaning that the day is split into two rotations of the clock, am and pm, meaning ‘ante meridian’ (before noon), and post meridian (afternoon).
>10 years in a decade‘dec’ is the latin prefix for 10
As you can see, the previous measurements are far less arbitrary than the American measurement systems.