kāla (11. 280)

Via ibīdem, we enjoyed contemplating this display that shows the passage of different units of time side-by-side advancing relative to the observer. Named for the Jain concept of that which brings forth change (also meaning death), the second is the smallest practical measurement, made up of countless and indivisible samaya—like Planck time though the zeptosecond or one sextillionth of a second is the smallest fragment of time that can be reliably calibrated—and itself representing about forty-eight seconds and the kşaṇa about forty-eight minutes. Aside from the more familiar units and the Hindu-Sanskrit tradition of describing the cosmological cycle, from microseconds to trillions of years, there’s also the milliday, invented by the Swatch company as one-thousandth part of a day or a .beat, the lustrum to mark the five-year interval between Roman censuses, the indiction for the fifteen-year requirement for tax assessments in the Empire, a ghurry, the time it took a water-clock to empty, gauged to divide the day into sixty intervals or rather twenty-four minutes and the chelek (חלק) one eighteenth of minute from the Babylonian for one degree of celestial rotation and a momentum, a medieval reckoning of the hours by the sun-dial, about forty moments for each twelve-hour solar day—as well as more informal but countable units.