We need to be careful not to interpret words that are not in the text. The Genesis narrative in the original does not say that God made the stars on the fourth day. He made the greater and lesser light, but the Hebrew verb עָשָׂה`asah made is not repeated in relation to the stars. The account of the fourth day, in Genesis 1:14‑17, mentions the stars only once. At the end of verse 16 the original Hebrew says and the stars. And the stars what? This sentence fragment follows the material on the three-fold purpose of lights in the sky, the making of them, and their commissioning to perform those three functions. It appears that the stars share in the purposes and commission of the greater and lesser luminaries.