Here's why:
* Earth's Tilt: Our planet is tilted on its axis. This tilt causes different parts of the Earth to face the Sun directly at different times of the year.
* Earth's Orbit: As Earth revolves around the Sun, our perspective changes. This change in perspective makes the stars appear to shift their positions in the sky.
Think of it like this: Imagine you're in a car driving around a roundabout. The buildings outside seem to move in relation to you as you drive. The stars are like those buildings, and our Earth's orbit is like the roundabout.
As a result of this motion, different constellations become visible at different times of the year. This is why we see the familiar constellation of Orion in the winter but not in the summer, and vice versa.
