Here's why:

* Lunar Phases: The phases of the Moon are caused by the changing angles at which we see the sunlit portion of the Moon as it orbits the Earth. This is a natural phenomenon, and the phases continue to occur regardless of whether it's day or night on Earth.

* Daylight: The reason we don't see the Moon during the daytime is often due to the brightness of the sun. The Moon is still there, but it is often too faint to be seen against the bright blue sky.

To summarize: The phases of the Moon are a result of its position relative to the Sun and Earth, and they continue to cycle regardless of the time of day on Earth. It's just harder to see the Moon during the day because of the sun's brightness.