We have no reason to believe that the light of verses 3 to 5 was any different from the light of verses 14 to 17. The language of verses 16, 17 is doubtless the language of appearances, as regards the fourth day. God made the sun and the moon and the stars, made them perhaps when the earth itself and the whole solar system were created, but on account of the dense clouds which surrounded the earth their light as bodies of light had not penetrated to the earth. On the fourth day this was removed, and the light shone out in the firmament of heaven.