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Time and Calendars · entry 34 of 52
There are 60 seconds in a minute and 60 minutes in an hour.
The longer version
The division comes from a counting system based on sixty, inherited through Greek astronomy from Mesopotamian scribes. Sixty divides cleanly by two, three, four, five, six, ten, twelve, fifteen, twenty and thirty, which makes fractions easy to handle without decimals. Halving and thirding a minute gives whole numbers of seconds.
That convenience is why the same base survives in angle measurement, where a circle holds 360 degrees. Attempts to decimalise time during the French Revolution were abandoned within about a decade, because clocks, habits and published tables all had to be remade at once. The metric system changed weights and lengths but never touched the clock.
Where this entry sits
These facts wander through clocks, calendars, time zones, and the long human effort to measure passing hours. You will find leap years, odd month lengths, ancient sundials, and the reasons modern timekeeping works the way it does. The full list sits on the Time and Calendars page, where every entry is listed in order.
More From Time and Calendars
Eight more entriesBabylonian mathematicians favored the number sixty, which is why minutes and hours use it.
Read 36Ancient Egyptians divided daylight into twelve parts, which helped shape the twelve-hour clock.
Read 37Mechanical clocks first appeared in medieval Europe, often mounted in towers for public use.
Read 38Clock faces usually move clockwise because that is the direction a sundial's shadow travels in the north.
Read 39Early mechanical clocks had no faces and simply struck bells to announce each hour.
Read 40Wristwatches became common only in the twentieth century, replacing pocket watches for most people.
Read 41Digital clocks display numbers directly instead of using hands that rotate around a dial.
Read 42Earth's rotation is gradually slowing, so occasional leap seconds keep clocks matched to the planet.
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