Genesis describes the days of creation from God's perspective of time, not mans. And they were in relation to the original source of light created on the first day, not our suns. The days of creation were not 24 hour days according to the account. God only later set mankinds perspective of days, with respect to the rotation of the earth in relation to our sun, on the fourth day of His creation when He created our sun. The amazing thing is that the ancient authors, who clearly knew that the sun was necessary in order for a day to occur, described a whole new perspective of time for God and man several thousand years before modern day astronomy realized that time is relative to ones position in the universe.
No, the amazing thing is how much you're willing to mangle the truth trying to backfit it to your ancient goatherder stories.