Here's why:

* Earth's Rotation: The Earth rotates on its axis from west to east. This means that the sun rises in the east and sets in the west.

* Facing the Sun: The side of the Earth facing the sun is the daytime side. This side is not always facing the east, but moves as the Earth rotates.

Think of it like this:

* Imagine holding a globe and shining a flashlight on it. As you turn the globe, different parts of the globe face the flashlight (the sun).

* The side facing the flashlight is the "daytime" side, and it changes as the globe rotates.

So, while the sun rises in the east, the half of the Earth facing the sun is constantly moving, not always facing east.