Etruscan Brontoscopy

Thunder and lightning last night. Tonight I discover the Etruscan Brontoscopic Calendar. "The original author [or oral narrator; the Etruscans didn't adopt a writing system until the following century] might have been a mysterious godlike child. Tages, aka the Puer Senex ('old man boy') was a strange grey-haired child of great wisdom and bad teeth who sprang up from a ploughed furrow. [...] The Etruscan Brontoscopic Calendar is a kind of almanac. It assumes that for every day of the year in Etruria, thunder has a different meaning. All the entries begin with the same phrase ει βροντηση - 'If it thunders...'."