Here's why:

* Sunlight is much stronger: The sun is a massive star that emits an immense amount of light. The moon, on the other hand, reflects sunlight, making it much dimmer.

* Atmospheric scattering: The Earth's atmosphere scatters sunlight, making the sky appear blue. This scattered light can be strong enough to obscure the moon's relatively faint glow, especially during daylight hours.

* Moon's position: While the moon orbits the Earth, it doesn't always appear in the same place in the sky. Sometimes, it's on the opposite side of the Earth from the sun, making it visible at night. Other times, it's closer to the sun, making it difficult to see during the day.

However, you can sometimes see the moon during the day. This is more likely to happen:

* Near a new moon: During the new moon phase, the moon is positioned between the Earth and the sun, and its illuminated side faces away from us. However, it's still possible to see a faint sliver of the moon near the sun, particularly during a crescent moon phase.

* When the moon is high in the sky: If the moon is high in the sky, its light might be more visible against the blue sky, especially during the day.

* When the sky is clear and there's little atmospheric haze: A clear sky allows more of the moon's light to reach our eyes.

So, while we may not see the moon often during the day, it's not entirely impossible!