There is again an under-cycle of infancy, of boyhood, of youth, of age, and the cycle of man's rise and fall. So there is the cycle of the life of the world; and the cycle of the creation of man and his destruction; the cycle of the reign of the races and nations; and cycle of time such as a year, a month, a week, a day, and an hour. The nature of each of these cycles shows three aspects: the beginning, the culmination, and the end -- which are named uruj, kemal, and zeval -- such as new moon, full moon, and waning moon; the sunrise, the zenith, and the sunset. These cycles, sub-cycles, and under-cycles, and the three aspects of their nature, are divided and distinguished by the nature and course of light.