The moon shall not give her light. The moon shines by reflected light of the sun and if it is darkened so will be the moon. So, too, the church shines by the light of Christ. When Christ's light was darkened by taking the Bible from the people the church give forth little light during the long night of the Middle Ages. The stars shall fall.
Stars represent great teachers of the church, apostles and evangelists.
Other stars, great church lights who apostatized, fell from heaven in another sense. After the long period of apostasy. Shall appear the sign of the Son of man. Some sign of his coming that every one will recognize when it is manifested. All the tribes of the earth mourn.