And God called the firmament Heaven. And the evening and the morning were the second day.
All Commentaries on Genesis 1:8 Go To Genesis 1
Augustine of Hippo
AD 430
Since Scripture called heaven the firmament, we can without absurdity hold that anything below the ethereal heaven, in which everything is peaceful and stable, is more mutable and perishable and is a kind of corporeal matter prior to the reception of beauty and the distinction of forms.
