In Cycles of Time, author Louis Komzsik offers a comprehensive study of time, its relation to astronomy, and its relative nature. He reviews interesting tidbits of the historical evolution of our understanding of time and discusses some philosophical ideas about the topic. He explores the history of time, its origins in the celestial cycles observed by ancient cultures, and the expansion of our time horizon into cosmic cycles. He examines and debunks the doomsday predictions about the year 2012, and discusses the large scale measuring of time, gradually refined by humankind with medium scale instruments of calendars bringing time to the horizon of a human lifetime. While investigating the physical aspects of time, Cycles of Time examines time's relativity and ponders the possibility of time travel. Influencing one's past, an attractive idea to all of us and the potential cause of the grandfather paradox, may not be theoretically possible, but also merits speculation. Cycles of Time explains time's very strong trichotomy of past, present, and future in their simplest definitions: the past we remember, the present we experience now, and the future we anticipate.