Genesis 1:6 ASV

⁴  And God saw the light, that it was good: and God divided the light from the darkness.

⁵  And God called the light Day, and the darkness he called Night. And there was evening and there was morning, one day.

⁶  And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.

⁷  And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.

⁸  And God called the firmament Heaven. And there was evening and there was morning, a second day.