Then the moon shall be confounded, and the sun ashamed, when the LORD of hosts shall reign in mount Zion, and in Jerusalem, and before his elders gloriously.
Read Chapter 24
The stars on the day of judgment will be seen obscurely, not because of a gradual waning of their own light but due to the overwhelming brilliance of the true light, who is the supreme Judge coming in majesty, and the light of the Father and the holy angels. Nevertheless, nothing should prevent us from understanding that the sun, the moon and other stars will be deprived temporarily of their own light, as happened to the sun at the Lord’s passion. But because the moon, which should have been full at that time, lay hidden behind the earth, Joel’s prophesy remains unfulfilled still today, for after he had said “the sun will be turned to darkness,” he added, “and the moon to blood before the great and magnificent day of the Lord comes.” Isaiah also spoke about the day of judgment, saying, “The moon will be ashamed and the sun confounded when the Lord of hosts reigns on Mount Zion and in Jerusalem and is glorified in the presence of Jerusalem’s elders.” - "Exposition of the Gospel of Mark ...
He [Isaiah] was pricked by the thorn of sin; you are decked with the flowers of virtue. “The moon shall be ashamed, and the sun confounded, when the Lord shall punish the host of heaven on high.” This is explained by another passage. “Even the stars are unclean in his sight”; and again, “He charges his angels with folly.” The moon is ashamed, the sun is confounded, and the sky covered with sackcloth. Shall we fearlessly and joyously, as though we were free from all sin, face the majesty of the Judge? After all, the mountains shall melt away, that is, all who are lifted up by pride, and all the host of the heavens, whether they are stars or angelic powers, shall fade away like heavens when the heavens shall be rolled together as a scroll. - "Against the Pelagians 2.24"