A planetarium model is a representation of celestial bodies and their movements, often used in educational settings to simulate the night sky. These models can be physical, like a globe showing the Earth and its rotation, or digital, using software to project stars and planets onto a dome. They help people understand astronomy concepts, such as the orbits of planets and the phases of the moon. Many planetarium models are designed to illustrate specific astronomical phenomena, such as eclipses or the changing positions of constellations throughout the year. They can be found in planetariums, science museums, and schools, making astronomy accessible and engaging for learners of all ages.