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31 And God saw every thing that he had made, and, behold, it was very good. And the evening and the morning were the sixth day.
'Three' denotes fullness, and 'a third,' not full.
(Referenser: Arcana Coelestia 2788 [1-13])
16 God made the two great lights: the greater light to rule the day, and the lesser light to rule the night. He also made the stars.