That's a very common misconception! While it's true that the Earth rotates, causing day and night, the amount of sunlight on the Earth at any given moment is actually much more complex.

Here's why:

* Earth's Tilt: The Earth is tilted on its axis at about 23.5 degrees. This tilt is the primary reason we have seasons. It also means that during the year, different parts of the Earth receive more direct sunlight, while others receive less.

* Time of Year: During the summer solstice, one hemisphere is tilted towards the sun, receiving more direct sunlight and longer days. During the winter solstice, the other hemisphere is tilted away, experiencing shorter days and less direct sunlight.

* Sunrise and Sunset: While the Earth is rotating, the sun isn't a single point of light. It has a diameter, and the transition from full darkness to full light, and vice versa, takes time. This is why we have sunrise and sunset.

So, at any given time, the Earth is not exactly split in half with sunlight and darkness. Instead, there's a gradual transition from a fully lit area to a fully dark area. The exact distribution of light and darkness depends on the time of year and the position of the sun in the sky.