The centuries old Persian poem 'Mar Nameh' describes in verse a method of augury; what seeing a snake on every one of the 30 days of a month will mean and what omen it will portend. The thirty-two couplets in Persian informative rhyme are shown here in beautifully handwritten Persian calligraphy. The poem is both translated and transliterated into English. The symbolic connection of the snake to Time is discussed and a modern approach to use the 'Mar Nameh' is described using the Zoroastrian Calendars. The Old Iranian calendar describes in detail the foundation of Persian calendar system and its ancient festivals, such as the New Year celebration of Nawruz, the Tiragan festival, and the feast of Mithra. The connection of the Persian calendar to the Egyptian and Babylonian calendars is also examined in depth. This book provides a detailed analysis of a text which has been dormant for several hundred years. It is an essential read for all who are interested in the art of divination.