"New Theories in Astronomy" by William Stirling is a scientific publication written in the early 20th century. The book presents a collection of Stirling's hypotheses and analyses concerning various aspects of astronomy, including the nature of celestial bodies and the principles of gravity. It aims to challenge established scientific theories and provide new insights into the workings of the universe, particularly through a critical examination of previous astronomical methodologies. The opening of the text introduces the author's reflections on the importance of knowledge in the science of astronomy, emphasizing the potential pitfalls of both limited and extensive understanding. Stirling outlines the historical context of weight and measurement in astronomy, discussing how astronomers have struggled with understanding the Earth's mass and density. He critiques existing theories, particularly those related to gravitational attraction, and sets the stage for his subsequent arguments by highlighting the inadequacies in traditional scientific explanations, thereby establishing a foundation for the novel theories he aims to put forth. (This is an automatically generated summary.)