The creation account was divided in the post-exilic period into six days to provide an etiology for Shabbat. This necessitated creating light on day one to distinguish between day and night. In turn, it required assigning significance to the sun and moon on day four beyond their role as sources of light.
Prof.
Christoph Berner
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The division of the Torah into five books is not mentioned anywhere in the Bible, yet by the early first millennium C.E., the Torah became known by the Greek name Pentateuch, literally “five scrolls.” When and why was this division created?
Dr.
Elaine Goodfriend
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