"Course of theoretical astronomy (determination of orbits of planets and comets with the help of counting machines)" is a unique work written by famous astronomers and scientists Orlov A. I. and B. A. This book will be a real discovery for everyone interested in astronomy, physics and mathematics, as well as for students and teachers seeking to deepen their knowledge in the field of celestial mechanics. The book offers readers a fascinating immersion into the world of astronomy, starting with the basics of orbital theory and ending with practical methods of calculating them. The authors share their knowledge of how to determine the orbits of planets and comets with the help of calculating machines, which makes the material accessible and understandable even for those who are just starting their way in this complex but exciting science. An intriguing approach to learning, based on a combination of theory and practice, allows readers not only to assimilate the material, but also to put it into practice. Who can like this book? First of all, it will be of interest to students of physical and mathematical specialties, as well as to everyone who is fond of astronomy and wants to understand the complex issues related to the movement of celestial bodies . Teachers and teachers will find useful materials for their classes in it, and astronomy lovers will be able to expand their horizons and learn a lot about the methods of calculating orbits. The book is suitable for both young and more mature readers who want to refresh their knowledge or learn new skills. The topics raised in the Course in Theoretical Astronomy cover a wide range of topics, ranging from the basics of celestial mechanics to modern methods of computation. The authors emphasize the importance of the accuracy of calculations and their impact on astronomical observations. The book also touches on issues related to the history of astronomy and the development of computational methods, making it not only a textbook, but also a fascinating reading for anyone interested in the history of science. The style of the Eagles is distinguished by clarity and accessibility of presentation. They skillfully use examples and illustrations to explain complex concepts, making the book easy to read. In their works there is always a desire for accuracy and scientific validity, which makes their works reliable sources of information. In addition, the Orlovs are known for their other works in the field of astronomy, which are also worthy of attention, for example, “Fundamentals of Astronomy” and “Heavenly Mechanics”. The course of theoretical astronomy will be an excellent addition to the library of any lover of science. It will not only enrich your knowledge, but also inspire further research in the field of astronomy. If you are looking for a high-quality and informative edition that will help you understand the complex issues of celestial mechanics, then this work is exactly what you need. Do not miss the opportunity to discover the world of astronomy with this wonderful course, which combines theory and practice, making the study of astronomy fascinating and accessible to everyone.