celestial sphere model

The celestial sphere is a conceptual tool where the sky is imagined as a vast, hollow sphere surrounding Earth, with stars fixed on its inner surface. This model helps us understand the apparent positions and movements of celestial objects, which seem to rotate around us due to Earth's rotation. By visualizing the sky as a giant sphere, astronomers can describe locations of stars and planets using coordinates similar to latitude and longitude on Earth. It’s a useful way to simplify the complex sky and track celestial objects' positions over time.