"Almagest or Mathematical Writing in 13 Books" is an outstanding work of the ancient Greek astronomer and mathematician Claudius Ptolemy, which has become a fundamental text in the field of astronomy for many centuries. Written in the 2nd century AD, the book is an extensive work in which Ptolemy systematizes knowledge about celestial bodies, their movement and relationships. This is not just a scientific treatise, but a real encyclopedia of astronomical knowledge of its time, which had a huge impact on the development of science in the Middle Ages and the Renaissance. In the Almagest, Ptolemy lays out his geocentric model of the universe, where the Earth is central and all celestial bodies revolve around it. He introduces the concept of epicycles - small circles in which the planets move, which allows us to explain their complex movements. This concept, although refuted later, became the basis for many astronomical calculations and observations. Ptolemy also offers methods for calculating the position of planets and predicting eclipses, which makes his work not only theoretical, but also practical. The book will be of interest not only to professional astronomers and mathematicians, but also to science lovers, students and anyone interested in the history of astronomy and the development of scientific thinking. It can attract the attention of readers of different ages, from schoolchildren who study the basics of astronomy, to adults who want to deepen their knowledge of how our ideas about the universe were formed. Almagest will be a real discovery for those who want to understand how ancient thinkers tried to explain the world around them and what methods they used to do this. The topics raised in the book cover not only astronomy, but also philosophy, mathematics, and the history of science. Ptolemy not only describes celestial phenomena, but also asks questions about the nature of motion, time, and space. His work raises important questions about how we perceive the world and how scientific theories can change over time. Readers will be able to see how Ptolemy's ideas influenced subsequent generations of scientists, including Copernicus and Galileo, and how they became the basis for a new astronomical revolution. Ptolemy's style is distinguished by clarity and logical presentation, which makes his work understandable even to those who do not have deep knowledge in mathematics or astronomy. His ability to explain complex concepts in simple language and to support them with mathematical calculations makes Almagest not only a scientific, but also a literary work. This creates a unique atmosphere in which the reader can not only learn, but also enjoy the process of cognition. If you are interested in such works as Carl Sagan's Cosmos or Stephen Gale's History of Astronomy, then Almagest will be an important addition to the library for you. The book may also be of interest to those seeking a deep understanding of the historical foundations of science and its evolution. In search queries, you can use phrases such as “Ancient Greek astronomy”, “Ptolemaic and his works”, “geocentric model of the universe” to find more information about this work and its impact on science. Almagest is not just a book about stars and planets, it is a window into the world of ancient science that allows us to understand how humanity came to modern ideas about the cosmos. Reading this work is an opportunity to touch a legacy that continues to inspire scientists and researchers around the world.