Jerome

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";21 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? …

Against the Pelagians 2.24 ↗

Bede

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. …

On the Gospel of Mark 4:13.24 ↗

Thomas Aquinas

580. Third, the glory of him who punishes, and first, of the judge: and the moon shall blush, that is, its splendor shall be thought nothing in comparison to the splendor of the body of Christ: the sun shall be turned into darkness, and the moon into blood: before the great and dreadful day of the Lord doth come (Joel 2:31); or, the worshippers of the sun and moon. Second, of the judge's assessors: when the Lord of hosts shall reign . . . …

Commentary on Isaiah ↗