Humans have created reliable instruments to measure time by using predictable repeating events that occur naturally, such as day turning to night or winter becoming spring. We think of these events in terms of days, weeks and years, and we use clocks and calendars to mark their passage.
But we also appear to possess an internal timepiece, which regulates our circadian (day/night) rhythms and allows us to register the duration of particular events. We use this “pacemaker” to compare the length of each new event with representations stored in memory. Effectively, we build up a knowledge bank of what a minute, an hour or a day feels like.
Muireann Irish e Claire O'Callaghan
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