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)

1837. That 'as the sun was going down' means the period of time and the state just before the close is clear from the meaning of 'the sun'. In the internal sense 'the sun' means the Lord, and because of this means the celestial things of love and charity, consequently love and charity themselves, dealt with already in 30-38, and 1053. From this it is evident that 'the going down of the sun' is the last period of time in the Church, which is called the close, when charity does not exist any longer. The Lord's Church is also compared to the times of day, its earliest time being compared to sunrise, or dawn and morning, and its final period to sundown, or evening and the shadows that fall then; for there is indeed a similarity between the two. In like manner the Church is compared to the seasons of the year, its earliest time being compared to spring when everything is flowering, while the time next to the last is compared to autumn when everything starts to die off. Indeed, the Church is also compared to metals, its first time being called golden, its last that of iron and clay, as in Daniel 2:31-33. These considerations show what is meant by 'as the sun was going down', namely that the period of time and the state just before the close are meant, for the sun had not yet gone down. In what follows the subject is the state of the Church when the sun had gone down, at which point thick darkness descended, and a smoking furnace and a flaming torch passed between the pieces.