Panchavimsha Brahmana

"The world of heaven is as far removed from this world, they say, as a thousand earths stacked one above the other."

"At a distance of a journey of forty days on horseback from the spot where the Sarasvati is lost (in the sand of the desert), (is situated) Plaksa Prasravaja."

"The Tandya Mahabrahmana (V.92) similarly states: The Ekashtaka day is the wife of the year. When this night comes the Lord of creation (Prajapati) resides with her. Immediately from the beginning of the year, the rites of initiation are observed."