When the cometPanstarrs (C/2011 L4) appeared in the sky back in 2013, Rod Chang wasapproached by a reporter asking what astrological influence it would have.Thequestion made him realise how little he knew about comets, and prompted him tostart studying the phenomenon, in the process reawakening his relationship withthe night sky and his love of astrophotography.Now, aftercollecting more data and learning how to generate a comet ephemeris, the authorhas a clearer picture of their astrological meaning which he demonstrates inthe form of many fascinating case studies.From a harmonious universe perspective,comets are seen as disruptors, irregular objects in the solar system, so thisbook is offered in the hope that it will encourage the reader to take more ofan interest in the extraordinary celestial objects that have perplexed,fascinated and even frightened stargazers since time immemorial.