One interesting predecessor to unified measurement and standardisation is that of time. Most people might not be aware how puzzling it is that, as of now, across the whole planet we share a common timekeeping system spread throughout most societies of the world. When you look at your watch, you see it divided into 12 or 24 segments, denoting hours, and each hour is divided into 60 units, called minutes. Again, each minute is divided into 60, and we call that division a second. None of this is new to you, but what should surprise all of us is that it is not surprising for most people on the planet! And that’s just it—seconds are the basic unit of measurement of time across the entire world. Why, and how this fact came to be, is not a given. In fact, timekeeping is an extremely aberrant, arbitrary, and silly system if we compare it to the more common numerical system in divisions of 10 (we will see the metric system later on). Why aren’t there 100 seconds in a minute, 100 minutes in an hour, and 10 hours in a day? We could all stop dividing by 60! Our system seems complicated, and it’s not only our adult selves that feel so. My father, who has worked in the educational system all his life, told me that children learn the decimal system quite quickly; however, it takes them much longer to internalise timekeeping. You might have experienced this difficulty yourself as a child, or seen it in your own children if you’ve raised them. Then why does this strange and somewhat difficult system not only exist but is also the same everywhere? Didn’t other parts of the world create different timekeeping systems that made more sense? Why are these no longer around? As we will see, in large part it is because our current international timekeeping standard comes from one of the oldest measures.
Timekeeping is quite common across cultures—perhaps it is a human universal. The easiest division of time is into days, as it is a cycle that dominates all our actions in life, especially our sleep cycles. The next division of time across cultures is usually the cycle of the moon. About 29.3 days have to pass for us to see the moon in the same phase and position in the sky. This moon cycle gives us a close approximation to our current month lengths of 30–31 or 28–29 days. The third rhythm that many cultures pick up on is the annual cycle of the Earth orbiting the Sun. For higher latitudes in both hemispheres, that annual revolution—together with the tilt of the Earth’s axis—gives strong variations between seasons. Days become noticeably longer and shorter along that rhythm, and the weather and natural world follow these changes, with cold during the short days, and heat during the long days. In tropical latitudes, where the variation in the length of the day is not as pronounced, the coming and going of the rainy seasons usually plays a similar role to the cold and hot cycles. In short, most humans around the planet adopted these three naturally occurring cycles as the basic units of time division. When combining the Moon and Sun cycles, this gives us the numbers 12 and 13—i.e. the number of lunar months in a solar year. But this concerns the calendar more than the clock.
We have two main methods of temporal measurement: the calendar and continuous timekeeping, which could in principle be independent of natural cycles. But the calendar is a kind of timekeeping and has given us two numbers to play with. The number 12 is prominent in many counting systems; it even has a specific name in English: a dozen. The number 13, not so much—it is even seen as a “bad luck” number in some cultures. Why is 12 popular and 13 hated, then? This difference is also due to boring calculus. It is easy to divide 12 by 2, 3, 4, and 6. Try doing that with 13—any luck? If you remember your prime numbers, 13 is one of them—only divisible by 1 and itself. Probably, most nerdy ancient people who had to do the tedious task of measuring time preferred the “neat” 12 instead of the unfriendly 13.
But why 60, then, for continuous timekeeping on a watch or clock? Why the 60, 60, 24 division?
We need to start talking about the Babylonians, and how they counted. How do you count using your hands? Most of us would count the number of fingers on each hand, up to 10. But one can increase the amount that can be counted by using the phalanges in each finger. If you count them on the four longer fingers of one hand, that gives you 12—once again this neat nerd number derived from solar and lunar cycles. Then, what better number to divide the daylight hours than 12? But there are an equal number of hours in the night (in equatorial regions), so the number of hours when the sun is out is roughly the same as when the sun is away. If daylight is 12 units and night is 12 units, that gives us the universal 24 divisions of the day: the infamous hours.
Then the 60. Going back to the Babylonian counting, if you count a dozen on, say, your left hand, and on your right hand you keep track of the number of dozens by flexing one finger each time, that gives you five dozens—or a total of 60. If we divide that hour into 60, we get the infamous minutes. The punchline, however, is that despite the importance of 12, the Babylonian sexagesimal system was based on six groups of ten, not five groups of twelve! In any case, that sexagesimal system is the basis for the 60 divisions—or hexagesimal—which the Babylonians also used to divide a circle into angles, another of the universal measures we will examine.
Why the infamous seconds exist, and are simply 60 divisions of a minute, is not such a clear story. Why wasn’t it a division of 10, or 100, or 24? The subunit of a second—a millisecond—is divided into 1,000 units, so 60, although used to define the minutes from an hour, had no need to be used again. What might explain the 60 seconds is another natural unit, quite random at that: the standard resting human heartbeat. If you measure your heartbeat after a period of rest, or just after waking up, there is a high likelihood that you’ll have just over 60 beats per minute.
However the infamous seconds really came to be, the Babylonians standardised them, and due to their central location, vertebrating the Africa–Eurasia connection, seconds, minutes, and hours spread. The large-scale societies around Babylon—such as Egypt, the Greeks, one of their successors Iran, and the polities of the Indian subcontinent—adopted the Babylonian system early on. Crucially, it spread to all the European nations, who then forced it into the administrative apparatus of their colonies, which, as we have seen, covered most of the planet. Even the Chinese adopted a version of the Babylonian sexagesimal division when the Ming dynasty commissioned Xu Guangqi in collaboration with the Jesuits to adapt the Gregorian calendar and timekeeping to the imperial system. Although this reform was only officially adopted during the Qing dynasty in the mid-17th century, it was partly influenced by the Jesuit Johann Adam Schall von Bell and his improved methods of predicting eclipses. Astronomy, we must remember, was deeply linked to astrology in both European and Chinese courts, and astronomers performed the functions of astrologers in advising rulers.
Calendar
Concerning the universality of the Gregorian calendar, it also seems a convoluted, silly, arbitrary system. Why are some months longer than others? Why is your birthday on a Tuesday one year and on a Friday another? There are vastly superior calendar systems out there. Though, some of these alternatives tend to require the addition of a 13th month and a bizarre annual “blank day”, which doesn’t go on the calendar at all. We just chill out, have a holiday, and pretend it’s not there.
The Gregorian calendar has a complicated and protracted history. All the successors of the Roman Empire, and the Christian churches, used the Julian calendar until AD 1582. The Julian calendar, as the name suggests, comes from the Julius Caesar. He borrowed it from the Egyptians and imposed it on the Roman Republic as a more stable alternative to the Roman system. The Catholic Church adopted the Julian calendar at the First Council of Nicaea in AD 325. However, Christians had conflicting ideas on how to celebrate Easter, and it took nearly half a millennium before most Christians agreed to follow the Nicaea rules. In the Egyptian calendar, once every four years a day is added to February. That’s the year when February has 29 days—and some people still joke that those born on that day don’t get to have birthdays.
The problem with adding one day every four years is that, after a few centuries, it messes up the seasons—meaning that the spring and autumn equinoxes, and the summer and winter solstices, begin to drift on the calendar. By the 16th century, this was still a minor issue (only ten days had shifted in 1550 years), and it didn’t seriously affect agricultural practices. However, the motivation for change was religious: the Catholic Church was concerned that Easter might not be celebrated in accordance with the scriptures. Easter follows a lunisolar rule, which causes the date to shift every year: it must occur on the first Sunday after the first full moon of spring. This meant that, technically, Easter could end up being celebrated in winter if the calendar drifted too far—risking some sort of cosmic blunder. It wasn’t equally important for all Christians, as many Eastern Orthodox churches still follow the Julian calendar.
Some sectors of the Catholic Church pushed for reform early on. In the late 15th century, the man chosen to oversee it was a German mathematician with the wonderful name Regiomontanus (Latin for “royal mountain”). Unfortunately, he died before the reform could be implemented. A century passed, during which all the Protestant wars took place. In the aftermath, a diminished Catholic Church finally agreed to set the new calendar—approved by Pope Gregory XIII, who gave the calendar its name. But the Pope could only set the liturgical calendar for the Church. The civil calendar—used by governments—had to be adopted by each administration. Moreover, the emerging Protestant denominations were deeply sceptical of anything coming from the Pope and were not eager to adopt a “papist” invention, even if it made sense. The Puritans even tried to ban Christmas for being too Catholic.
Nevertheless, Catholic powers and administrations such as the Polish–Lithuanian Commonwealth, the Kingdom of Spain (which then included Portugal and most of Italy), and France, as well as their colonies and dependencies, adopted the Gregorian calendar as their administrative standard. Parts of the Netherlands under Spanish control (now Belgium) also adopted it; the rest of the United Provinces followed over the next few decades. So did the Holy Roman Empire, including Austria, Hungary, Bohemia, and many of the German states.
Some Protestant nations, like Denmark and Sweden, also adopted the Gregorian calendar relatively early. Though Sweden did so in a somewhat chaotic way—switching to the Julian calendar, then to the Gregorian, then back again, and finally settling on the Gregorian in 1752, the same year Britain and its colonies adopted it. To avoid referring to the Pope, the British called it “An Act for regulating the Commencement of the Year, and for correcting the Calendar now in Use”. For years, Swiss towns just a few kilometres apart had calendars ten days out of sync—allowing people to celebrate Christmas or Carnival twice in one year!
Later on, Eastern Orthodox countries such as Greece, Serbia, and Russia adopted the Gregorian calendar for civil purposes, though many retained the Julian calendar for liturgical use—or switched to the “New Julian” calendar, making things even more confusing. This is why people in Moscow celebrate Christmas on 7 January (in the standard Gregorian calendar). Others, like Ukraine, have switched to the Gregorian calendar entirely.
The Gregorian calendar is now the de facto global calendar—though it was never formally agreed upon. Administratively, all European countries and their colonies adopted it. Even the Chinese, as we’ve seen, integrated it into imperial systems. Of the few non-colonised countries, only Nepal, Afghanistan, Iran, and Ethiopia still use different civil calendars. Others like Japan, China, Thailand, and Saudi Arabia eventually adopted the Gregorian calendar for administrative purposes—Saudi Arabia only doing so in 2016! Some of these countries still use different systems for counting years or determining the New Year, but their months, leap years, and weekdays follow the Gregorian calendar. In many places—such as the Orthodox Christian and Muslim worlds—two systems coexist: one for liturgy and another for administration. Only Iran’s Solar Hijri calendar, or Shamsi, is more astronomically accurate than the Gregorian. It sets the start of the year to within a second of the spring equinox on Iran’s standard meridian at 52.5° East.
Finally, most international institutions—the United Nations, the Olympics, global research networks—use the Gregorian calendar, reinforcing its role as the de facto global timekeeping standard. Timekeeping—both in hours–minutes–seconds and in calendar form—illustrates how ancient measurement systems, copied or adapted from long-gone administrations like Pharaonic Egypt and Babylon, are still with us and have become near-universal norms, despite never being formally imposed on the entire world.
Later we will see that something like “timekeeping” is not so unquestioned. And that this seemingly universal but rule-less agreement on time has also undergone standardisation—and even the creation of global institutions, as we will see in the case of standard time and the truly infamous leap second—imagine scary quotes. Like the second, double globals, in use and in institunionalised, is what we will need to pay attention to when asking these texts question.
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