Are we aware of how much we depend on time and how much we value each moment? Having reached a certain age, and perhaps generalizing, the present seems increasingly insubstantial, imperceptible; we cannot even feel it. The past is dim and distant, unless memories captivate us with experienced emotions. And the future inevitably becomes the present…, or the other way round.
The diverse methods for measuring existence, events and the unfolding of human life have, believe it or not, undergone more than their fair share of comings and goings over the years, acceptance according to religious confession, lags and updates. That is exactly what calendars were created for, though we do not know whether they originally measured the length of the day, the week or the year.