"Didn't you mention that the Upper Province is a pseudo realm that was created from the Lower Province of Dao Martial Saint Land?" Duan Ling Tian asked.
"Yes," Elder Huo replied almost instantly as though he had already anticipated this question from Duan Ling Tian, "The Upper Province is a pseudo realm created from the Lower Province of the Dao Martial Saint. Since it's part of the Saint Province Realm, it has the same space barrier! That's why we can see the sun and other planets from the large mundane realm… As for why the Saint Province Realm has day and night, it's due to the movements of the planets from the large mundane realm as they revolve around the sun. When the planets block the sun, the Saint Province Realm would be dark, entering the night phase. Meanwhile, the planets that block the sunlight will reflect some of the light, creating what we call the moon."