The Moon by Thomas Gwyn Elger is a comprehensive and detailed exploration of Earth’s only natural satellite, written in the late 19th century. This classic work serves as both a scientific treatise and a practical guide for amateur astronomers and lunar observers. Elger meticulously describes the Moon’s physical characteristics, including its surface features such as craters, mountains, valleys, and plains, providing readers with vivid accounts and careful observations. The book delves into the history of lunar study, summarizing the contributions of earlier astronomers and the evolution of telescopic technology that made detailed lunar mapping possible. Elger’s passion for selenography—the study of the Moon’s surface—shines through as he offers step-by-step instructions for observing and sketching the Moon, making the book accessible to both beginners and experienced stargazers. He discusses the best times and methods for observation, the effects of light and shadow on lunar features, and the challenges posed by Earth’s atmosphere. The text is enriched with numerous illustrations and maps, many drawn by Elger himself, which help readers identify and appreciate the Moon’s diverse landscapes. Beyond its practical guidance, The Moon also explores scientific theories about the Moon’s origin, its phases, and its influence on Earth. Elger addresses questions about lunar geology, the possibility of volcanic activity, and the absence of an atmosphere, all while maintaining a clear and engaging narrative style. The book stands as a testament to Victorian-era scientific curiosity and remains a valuable resource for anyone interested in the Moon, astronomy, or the history of science.