"A practical astronomer. Scientific book" is a publication that allows the reader to better understand astronomy. The book presents not only placed illustrations that explain the basic principles of light and colors, but also practical descriptions of various types of telescopes, showing in which areas equatorial-transit, circular, and other astronomical instruments can be used. Particular attention is paid to the large telescope of Count Ross, where its features and possibilities in the study of cosmic bodies are revealed. The author of the book - Thomas Dick, a renowned scientist in the field of astronomy, has successfully combined theoretical knowledge with practical research to create this valuable reference book for amateurs and professionals in the field of astronomy.