“The Theory of Relativity for Astronomers” is a fascinating and informative work written by M. In. Sazhin, which opens the door to the world of one of the most revolutionary theories in the history of science This book will be a real guide for anyone interested in astronomy, physics and the mysteries of the universe. In it, the author explains the complex concepts of relativity in an accessible and fascinating way, making them understandable even for those who do not have deep knowledge in the field of physics. The book covers a wide range of topics related to general and special relativity, including concepts such as spacetime curvature, gravitational waves, and black holes. Sazhin not only explains the theoretical aspects, but also shows how these ideas are applied in practice in astronomical observations and research. The reader will be able to learn how the theory of relativity has influenced our understanding of phenomena such as light effects near massive objects and the motion of planets in the gravitational field. This book will be especially interesting for students and graduate students studying physics and astronomy, as well as science lovers who want to deepen their knowledge of the universe. It is suitable both for those who are just beginning to get acquainted with the basics of the theory of relativity, and for more experienced readers who want to refresh their knowledge and see how modern research confirms or develops Einstein’s ideas. One of the key topics addressed in the book is the interaction between theory and practice. Sazhin demonstrates how theoretical assumptions are reflected in real astronomical observations, such as measurements of gravitational redshift or the study of X-ray sources in near-Earth space. This creates a unique opportunity for the reader to see how scientific theories become tools for opening new horizons in astronomy. The author's style is clear and accessible. M. In. Sazhin skillfully combines scientific rigor with a fascinating narrative, which makes reading not only informative, but also pleasant. His previous works, such as Astronomy for All and Black Hole Physics, have already established him as a talented popularizer of science, and Theory of Relativity for Astronomers continues this tradition. The book also raises important philosophical questions about the nature of time and space, as well as man's place in the universe. These reflections make the work not only scientific, but also deeply humanistic, which allows the reader to think about his place in the vast expanses of space. If you are looking for literature that will help you understand complex scientific concepts and inspire further research in astronomy and physics, “The Theory of Relativity for Astronomers” will be an excellent choice. This book will not only expand your horizons, but also give you new ideas and inspiration to explore the mysteries of our universe. Do not miss the opportunity to immerse yourself in the world of science with M. In. Sazhin and discover the secrets that the theory of relativity hides .