"His Comets" refers to a series of celestial objects associated with the astronomer Edmond Halley. Halley is best known for his work on comets, particularly Halley's Comet, which is named after him. He calculated the orbit of this comet and predicted its return, demonstrating the periodic nature of comets. The term can also encompass other comets that Halley studied or predicted, contributing to the understanding of their behavior and characteristics. His research laid the groundwork for modern cometary science, influencing how astronomers observe and classify these fascinating objects in our solar system.