Soma's curse and the waxing moon
Soma, the moon, is cursed and loses his lustre. He travels to Prabhasa, bathes in the Saraswati at the point where the river meets the sea, and worships Shiva here until his light returns.
The remission is partial. In this account that is the explanation for the lunar cycle: the moon wanes and waxes rather than being extinguished or restored once and for all.
The site takes its name from the episode — Somanatha, the lord of Soma. The Jnanasamhita gives the story and the Jyotirlinga listing together.
The fuller Puranic frame around the curse — who pronounced it and why — is not told here, as we have not yet found it in a primary text; the circumstances differ between retellings.
Where this account comes from
- Purana: Shiva Purana, Jnanasamhita 13
- Scholarship: Romila Thapar, Somanatha: The Many Voices of a History, Penguin, 2004, pp. 18, 23–24