Here's a breakdown:
* Earth's Rotation: Our planet rotates on its axis once every 24 hours. This rotation causes the apparent movement of celestial objects, including stars, across the sky.
* Degrees in a Circle: A circle has 360 degrees.
* Time and Rotation: Since the Earth completes a full rotation in 24 hours, it moves 360 degrees in 24 hours. This means it moves 15 degrees every hour (360 degrees / 24 hours = 15 degrees/hour).
Think of it like this: Imagine you're standing on a spinning merry-go-round. The objects around you appear to be moving, even though you are the one rotating. Similarly, the stars appear to move across the sky as the Earth rotates beneath them.
Important Note: The stars themselves are not actually moving across the sky at 15 degrees per hour. Their apparent motion is an illusion caused by our perspective as observers on a rotating Earth.
