Here's why we see the moon at night:
* The moon reflects sunlight. It doesn't produce its own light. The sun shines on the moon, and some of that light bounces back towards Earth, making it visible.
* Earth's rotation. The Earth is constantly spinning. As our planet rotates, different parts of the Earth face the sun during the day, and face away from the sun at night.
* Moon's position. The moon orbits the Earth, and its position relative to the sun and Earth changes over time. Sometimes the moon is on the same side of the Earth as the sun (this is during the day), and sometimes it's on the opposite side (this is during the night).
So, the moon is visible at night because it's reflecting sunlight and because the Earth has rotated so that our side of the planet is facing away from the sun, allowing us to see the illuminated moon.
