Each time I fly and am treated to an evening sky amidst the stars--whether over the western United States or the South China Sea, the north Atlantic or north Pacific, the Mediterranean or the Balkan Peninsula--I take stock of the blackness of space, punctuated as it were by tiny beacons of light, and then pause for a moment, seized, when I spy an old friend, the moon.
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How many people stop to gaze at it, to ponder not its existence per se, but its meanings--meanings that no doubt become the moon's existence and its essence?
It is such an ordinary thing that we hardly notice it. There it is, that celestial object of ours, dependent on Earth's gravitational pull which drastically slows the moon's rotational speed and locks the moon in orbit, suspended in a state of perpetual revolution appearing each night in different form yet repeating itself exactly every 29.5 days.
The appearance of the thing--not its substance, not its essence--changes. And yet we treat those appearances as essential: waxing or waning, full or new, gibbous or crescent. These phases brought on by cyclical regularity become an essence, a feature around which cultures have forged calendars and thus make sense of time.
A calendar: not merely does it possess a specific structural form as an outline of days, weeks, months, and years, but also a broader, natural-ideational rendering of the passage of time. Pure lunar based calendars such as the Hijri or Islamic calendar are not synchronous with the solar calendar, and thus are not seasonally based. The Jewish lunisolar calendar, in contrast, compensates for the moon's annual drift of 11 or 12 days by inserting an additional month, Adar II, every two or three years to keep cultural and religious holidays in synch with the seasons (so as to to retain some connection between the socio-cultural construction of time and the seasons lest Passover fall in autumn and Hanukkah in July).
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Calendars: incantations as it were.
To what: well, that is up to us, to the cultures which forge their renderings of time and mark not just is passing but foretell its coming with cyclical regularity.
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