One of the eighteen major Purana texts, namely, Bhavishya Purana describes the specialty of the Sapthami Thithi (Phase of the Moon). Sapthami is the special Thithi for the Sun. The Bhavishya Purana covers the subject of Sapthami Thithi from Chapters 47 to Chapter 216. Chapter116 describes the importance of Ratha Sapthami rituals.