Summary:
"A Text-Book of Astronomy" by George C. Comstock is a scientific publication written in the early 20th century. The work serves as an educational resource, concentrating on the principles and measurements needed for the study of astronomy, as well as various astronomical phenomena and celestial mechanics. The book is designed with a practical approach that emphasizes hands-on observational methods for both students and teachers. The opening of the text outlines Comstock's intent to provide a structured educational framework rather than a comprehensive compendium of astronomy. It emphasizes the importance of accurate measurement in astronomy, introducing the necessary tools and techniques to observe and record celestial phenomena. Through practical exercises, students are encouraged to engage directly with the night sky, measure angles and time, and explore the diurnal motion of stars. The initial chapters also discuss the foundational concepts of angles and time measurement, vital for the practical study of celestial bodies, setting a tone of active learning that characterizes the entire textbook. (This is an automatically generated summary.)