[editor-surveyor]

He repeated that phrase to set out his days of creation.

How could they be other than days from sun to sun?
.

[ravenwolf]

He repeated that phrase to set out his days of creation.

How could they be other than days from sun to sun?

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Yes, that works out fine until God rests on the seventh day and then says, in verse 4 these are the generations in which the heavens and the earth when they were created, in the day that God made the earth and the heavens.

So it took generations according to verse 4 but was counted as one day.