Here's why:

* The Moon orbits the Earth: The moon is constantly moving around our planet, and its position in the sky changes throughout the day and night.

* The Sun is much farther away: The sun is much, much further away from Earth than the moon. This means the sun's light travels to Earth at a much shallower angle, allowing it to illuminate the sky even when the moon is visible.

How it looks:

* Daytime Moon: During the day, the moon is often still visible, even though it's much fainter than the sun. It might be a thin crescent or a nearly full moon, depending on its phase.

* Evening/Morning Sky: The moon can be seen in the sky for a period of time before sunrise or after sunset. This is when it's most prominent and can appear to be "close" to the sun in the sky.

Key point: The moon and sun appearing together doesn't mean they are physically close in space. It's just a matter of perspective from our viewpoint on Earth.