Dost thou know when God disposed them, and caused the light of his cloud to shine? Dost thou know when God disposed them - Dost thou know the laws by which they are governed; and the causes which produce such and such phenomena?
And caused the light of his cloud to shine? - Almost every critic of note understands this of the rainbow, which God gave as a sign that the earth should no more be destroyed by water. See Genesis 9:13 (note), and the note there.