III: Day 2 heaven and air by expanding the waters
III. The works of the second day are heaven and air, produced by GOD through the Word by expanding and distinguishing between some waters and others.
Someone may ask how heaven, created in the beginning, is now said to have been made on the second day. Reply: in the beginning the angelic heaven was created from nothing; here, however, the expanse from the watery part of the earth produced in the beginning and dissolved in the first night, the earthly thickness removed, received the character of heaven and air, and seems properly called shamayim by the Hebrews, as if where the waters are. Bede and Strabus say the empyrean heaven was created on the first day — which we with Moses said was produced in the beginning — and on the second the starry heaven, and that this is the firmament of which Basil the Great, Ambrose, Bonaventure, Telesio, and the Pythagoreans speak. The watery heaven or expanse distinguishing upper from lower waters is therefore the work of the second day.
Latin
III. Opera secundi diei sunt caelum et aer a DEO λόγῳ expandendo et distinguendo inter aquas unas et alteras producta. Hic quaerat forsan aliquis, cum caelum creatum sit in principio, qui nunc dicatur factum secundo die. Respondetur: in principio creatum esse caelum angelicum e nihilo; hic vero expansum ex terra in principio productae et prima nocte solutae parte aquea, remoto crassamento terreo, caeli aerisque rationem accepit, proprieque schamajim, quasi ubi aquae, Hebraeis dictum videtur. Beda et Strabus die primo dicunt creatum caelum empyreum, quod nos cum Mose diximus productum in principio; secundo sidereum, et hoc esse firmamentum, de quo Basilius Magnus, Ambrosius, Bonaventura, Telesius et Pythagorici. Caelum igitur aqueum sive expansum distinguens aquas superiores ab inferioribus opus est secundi diei.