Why does 1 hour has 60 minutes?
The division of an hour into 60 minutes traces back to ancient Mesopotamia and their use of the sexagesimal system (base 60) for mathematics and astronomy. Here's a detailed explanation:
1. Origins in Ancient Babylon:
The Babylonians used a base-60 system because it is highly divisible. Sixty can be evenly divided by 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30, making calculations involving fractions much simpler.
2. Adoption in Timekeeping:
The concept of dividing time into 60-minute hours likely emerged from astronomical observations. Ancient civilizations divided the day into 12 "hours" of daylight and 12 "hours" of night, influenced by the 12 lunar cycles in a year and the approximate 12 zodiac constellations.
3. Integration by Greeks and Romans:
The sexagesimal system spread from the Babylonians to the Greeks, who used it in their astronomical calculations. The Romans later adopted it for their timekeeping systems.
4. Medieval and Modern Use:
During the Middle Ages, mechanical clocks adopted the division of an hour into 60 minutes and a minute into 60 seconds, perpetuating the sexagesimal division.
Thus, the historical and mathematical convenience of base 60 is the reason 1 hour has 60 minutes!
Also the division of minutes into 60 seconds follows the same historical reasoning as the division of an hour into 60 minutes. Here’s how it all connects:
1. Sexagesimal System
The ancient Babylonian base-60 system was applied not only to hours but also to finer divisions of time. Their astronomical calculations required precise measurements, and dividing smaller units into 60 parts provided simplicity in dealing with fractions.
2. Subdivision of Time
The hour was divided into 60 minutes to maintain consistency with the sexagesimal system.
Minutes were further divided into 60 seconds to extend precision, particularly in astronomy.
The word "second" comes from the Latin phrase pars minuta secunda, meaning "second small part" (the first small part being the minute, or pars minuta prima).
3. Astronomical Necessity
Ancient astronomers needed a precise system to track celestial movements. Dividing time into smaller units—first minutes, then seconds—helped them map the stars and planets accurately.
4. Spread to Mechanical Clocks
When mechanical clocks were developed in medieval Europe, they incorporated these divisions of time into their designs. Minutes and seconds became standard, following the precedent set by earlier astronomical practices.
In summary, the use of 60 as the base for seconds and minutes originates from the same sexagesimal system used for hours, driven by mathematical convenience and the needs of ancient astronomers.
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