Here's why:

* Earth's Tilt: The Earth is tilted on its axis. This tilt causes different parts of the Earth to face the Sun more directly at different times of the year.

* Night Sky View: As the Earth orbits the Sun, our view of the night sky changes. Constellations that are visible in one season might be obscured by the Sun's light in another.

* Seasonal Constellations: Constellations like Orion are prominent in the winter sky, while constellations like Ursa Major (the Big Dipper) are more visible in the spring and summer.