How did the Etruscans develop lightning interpretation into a systematic practice?

The Etruscans developed lightning interpretation into a systematic practice as part of the Etrusca disciplina, a body of religious lore believed to have been revealed by the prophet Tages. This system was rooted in a cosmology that viewed the universe as a reflection of divine will, where the celestial dome was divided into 16 distinct compartments, each inhabited by specific deities.1

Because the Etruscans believed that gods manifested their nature through natural phenomena, they treated lightning as a primary vehicle for divine communication. Haruspices—specialized diviners—interpreted these celestial events by mapping them against the sacred subdivisions of the sky. This practice was highly structured, functioning as a complex pseudoscience that required expert analysis to determine the gods' intentions. When lightning or other portents occurred, these diviners were responsible for interpreting the message and prescribing necessary expiatory or protective ceremonies to address the divine response. This methodical approach to reading the heavens was later extensively adopted by the Romans.12