The reason we see the moon at all is because light from the sun is reflected off the surface of the moon and it bounces towards us. The moon is a bit like a mirror out in space. Because the earth is always moving around the sun, and the moon always moving around the earth sometimes the moon is in just the right position to reflect some of the suns light towards us during the day.
We see the moon at night because the sun shines light on it, and the light is reflected back to earth.
The moon travels round the earth and the earth travels round the sun. The earth also spins around – one spin = one day. So sometimes the earth has not made a complete spin before we see the moon in the sky.
On very rare, but special occasions, the moon and the sun can be seen in the sky IN THE SAME PLACE. This is called an eclipse, when the sun, the moon and the earth are in a perfect line. http://en.wikipedia.org/wiki/Eclipse
As the others have said, it is all about reflection! The moon reflects light coming from the sun towards us and into our eyes allowing us to see it, sometime during the day!
Amazingly this can also happen with the other planets in our solar system. They too can reflect the suns light towards us allowing us to sometime see them without using a telescope. Sadly they are a lot further away from us than the moon so they are really small in the sky meaning they look a lot like stars making them hard to spot, but it can be done if you know where to look!
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Black scorpion commented on :
thanks you