The city had no need of the sun or of the moon to shine in it,[j] for the glory of God illuminated it

Revelations 21:22-27

In the new earth, there would be no need for temple to go to worship and no Sun to produce light. The reason is because God will be there, hence no need for a place to worship and no need for other light than God. There will still be nations and kings and they will bring Glory to God. The inhabitants are those whose names are written in the Lamb's Book of Life.