The number 12 has played a key role in human culture, showing up in places as diverse as the hours of the day, the tribes of Israel, the disciples of Christ, the jury of your peers, the major gods of Olympus, the inches in a foot, the Chinese Zodiac, the Latin Zodiac, or the egg-carton.
One reason for this is that 12 is divisible in three different ways: by 12 and 1, by 6 and 2, and by 4 and 3. Not until 18 (another significant number, in both Hinduism and Judaism) is a number again divisible in three ways. This is also the root of 13’s bad luck: it’s a prime number, divisible only by itself and 1. 13 throws off 12’s groove.
Numerology and Public Transit?
As in the case of the clock, calendar, and egg-carton, 12’s divisibility might be put to practical use in public transit.
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