In addition to introducing the reader to the symbolism of the Celtic horoscope, which is based on their worship of trees, the author offers a brief introduction to who the Celts were, what their religion, symbolism was, as well as basic information about
British author Adrian Gilbert (co-author of The Mayan Prophecies from 1995) in The End of Time offers the most thorough and sober modern interpretation of the Mayan calendar and the so-called "2012 prophecy", completely rejecting New Age hysteria.