"The Entropy of Parabola" is a guide to one of the greatest books in world literature, Thomas Pynchon's novel "Gravity's Rainbow," designed for the most inquisitive and discerning readers. This publication includes notes on rare, unusual, and interesting words and expressions, commentary on each chapter of the novel, background information on the characters, chronology, and research articles on various related topics. The book is based on materials posted on the website pynchon.ru, which are now published in a new edition. The publication is accompanied by black-and-white and color illustrations.