In Hindu philosophy, Jyotisha is traditional Indian astrology considered to be one of the oldest systems of astrology in the world. It is considered the study or science of jyoti, or divine light. It is one of the six disciplines of the Vedanga and is also discussed within the "Rig Veda," although there is evidence of its practice prior to documentation in the Hindu scriptures.
In Hindu worship, jyotirlinga is a devotional object used in worship practices toward Shiva. The term means “the radiant sign of the Almighty Shiva,” and is a tribute to the jyoti of the deity. Across India, there are 12 traditional shrines devoted to this purpose.