If the preceding section was about Babylon, this is a wider apocalyptic total destruction on the day of Yahweh, a kind of dark end of time. This day of the Lord will be a cruel day with wrath and anger. The earth will become desolate as sinners will be destroyed. All the heavenly lights will be extinguished. The stars in the heavens as well as the constellations will no longer give any light. Even the rising sun will be dark, while the moon will no longer glow. This will be a time of total darkness.
Sirach indicates that the stars show the glory of the heavens. They glow in the heights as ordered by the Lord. They stand there fixed by the Holy One as they never relax. Once again, we see a static view of the universe with everything in their fixed place according to God.