The sun and moon don't actually "come out" in the way we think of them. They are always there in the sky, even during the day.

Here's a breakdown:

* The Sun: The sun is a star, and it's what provides light to our planet. We see it during the day because the Earth rotates, and we are facing the sun during this time. When the Earth rotates to the point where we are facing away from the sun, it becomes night.

* The Moon: The moon reflects sunlight. We see the moon at night because the sun is shining on it, and the reflected light reaches our eyes. During the day, the moon is still there, but the sunlight is too bright for us to see it.

So, the sun is always "out" during the day, and the moon is always "out", but we only see it when the sun isn't shining brightly enough to overwhelm its reflected light.