What's a day

• Genesis 1:5 (ASV)
• Genesis 1:14 (ASV)
• Genesis 1:15 (ASV)
• Genesis 1:16 (ASV)
• Genesis 1:17 (ASV)
• Genesis 1:18 (ASV)
• Genesis 1:19 (ASV)

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It appears God doesn't create a "sun" (v14-19) until after referencing the word "Day" (v1). I wonder how long a day is if there is no sun to rotate the earth.

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