The Sun changes its position in space therefore it cannot be regarded as being 'in a condition of rest' is a thought-provoking scientific treatise that delves into the dynamic nature of our solar system's central star. Drawing from astronomical observations and the evolving understanding of celestial mechanics in the early 20th century, the book challenges the long-held notion of the Sun as a fixed, unmoving anchor in the cosmos. Instead, it presents compelling arguments and evidence that the Sun, like all celestial bodies, is in constant motion-traversing the vast expanse of the Milky Way galaxy along with its planetary retinue. The author meticulously examines the historical context of solar studies, referencing the works of Copernicus, Galileo, and Newton, and highlights how advancements in telescopic technology and mathematical modeling have revolutionized our perception of the universe. Through clear explanations and detailed diagrams, the book illustrates the Sun's journey through space, its gravitational interactions with other stars, and the implications of its movement for the orbits of the planets, including Earth. In addition to its scientific content, the book explores the philosophical ramifications of a moving Sun, questioning humanity's place in an ever-changing universe and the limitations of our observational perspective. It addresses common misconceptions, refutes outdated theories, and encourages readers to embrace a more dynamic and interconnected view of the cosmos. Rich in historical anecdotes, scientific rigor, and accessible language, The Sun changes its position in space therefore it cannot be regarded as being 'in a condition of rest' is an essential read for anyone interested in astronomy, the history of science, or the profound mysteries of the universe.