Génesis 1

And God called the expanse, heavens. So it was evening—and it was morning, a, second day.

Y llamó Dios á la expansión Cielos: y fué la tarde y la mañana el día segundo.

And God called the firmament Heaven. And the evening and the morning were the second day.

God called the expanse “sky”. There was evening and there was morning, a second day.