Which commandeth the sun, and it riseth not. A magnificent idea of God's power, and, of course, quite true. All the movements of the earth and of the heavenly bodies are movements which God causes, and could at any moment suspend.
The sun only rises upon the earth each day because God causes it to rise. If he were once to intermit his hand, the whole universe would fall into confusion. And sealeth up the stars. Either covers them with a thick darkness, which their rays cannot penetrate, or otherwise renders them invisible.
The idea is that God, if he pleases, can remove the stars out of man's sight, hide them away, seal them up.