Homa Variations: The Study of Ritual Change Across the Longue DuréeFound in many different religious cultures, the practice of making votive offerings into fire dates back to the earliest periods of human history. Throughout the tantric world, this kind of ritual offering practice is known as the homa. With roots in Vedic and Zoroastrian rituals, the tantric homa was formed in early medieval India. Since that time tantric Buddhist practitioners transmitted it to East and Central Asia, and more recently to Europe and