The 'sun' in the Word, when referring to the Lord, signifies His divine love and wisdom. Because the sun represents the Lord, with respect to His divine love wisdom, since ancient times even to the present day, worship is done and temples are built facing the rising sun. The sun signifies celestial and spiritual love and also the Lord regarding His divine love, and so the good of love from Him. In the opposite sense, it signifies a denial of the Lord's divinity, and so adulteration of the good of love.

In Genesis 15:12, 19:23, this signifies the time and state before consummation; for the sun signifies the Lord, and the celestial things of love and charity; so its setting represents the last time of the church. Its rising signifies a coming of the Lord, and the first period of a new church. (Arcana Coelestia 1837, 1859)

In Jeremiah 8:1, this signifies self-love and its lusts. (Arcana Coelestia 2441)

In Revelation 12:1, this signifies love. (Arcana Coelestia 253, Arcana Coelestia 3272[2])

Sun signifies the good of love. (Arcana Coelestia 4918[3]）

(Odkazy: Apocalypse Explained 709)

369. Verse 5. And when he had opened the third seal, signifies prediction respecting the state that next follows with those who are of the church where the Word is. This is evident from what has been said above (n. 351, 352, 361); for this and the following chapter treat of the state of the Christian Church, or the church where the Word is, from its beginning to its end, or from the time of the Lord down to the Last Judgment. For the new church that is called the Christian Church, and that was begun by the Lord when He was in the world, and afterwards propagated, has successively decreased down to this time, which is its last time, in which is the judgment. Predictions respecting these successive states of the church are here brought forth, as from a book, by various representatives; but it is to be known that such predictions were not seen and read in a book when its seals were opened, but were made manifest through the heavens from the Lord before the angels of the inmost heaven; and were represented in the ultimates of heaven by such things as are related in this chapter, namely, by horses of various colors, and afterwards by earthquakes, by the darkenings of the sun and moon, and by the falling of the stars to the earth.

[2] These, however, were appearances before the angels of the ultimate heaven, signifying such things as were heard and perceived in the inmost heaven where there were not such appearances; for whatever is heard, thought, and perceived in the inmost heaven from the Lord, when it descends through the middle heaven to the ultimate, is turned into such appearances. In this way are the arcana of Divine wisdom made known before the angels of the ultimate heaven. Those there who are intelligent perceive these arcana by the correspondences; but the lowest of them do not perceive, but only know that there are arcana therein, nor do they inquire further; John was with these when "in the spirit" or in vision. This has been said to make known how the Word was written, namely, from such things as were seen and heard in the ultimates of heaven, thus by pure correspondences and representatives, in each one of which lie concealed innumerable and ineffable arcana of Divine wisdom.