Astronomers use something called "surface brightness" to measure how bright an object appears in the sky. The Moon, being closer to Earth than the stars, appears brighter than the sky itself. That's why we can see the Moon during the day!
However, there are other things that can affect how well we can see the Moon during the day. These include the phase of the Moon (whether it's a crescent, half, or full Moon), the time of year, and the weather conditions on that particular day.
On average, we can see the Moon during the day about 25 days a year. But did you know that there are about 5 days before and after a new Moon and a full Moon when the Moon is not visible during the day? During a new Moon, the Moon is so close to the Sun that it's not visible at all. And during a full Moon, the Moon rises at sunset and sets at sunrise, so we can only see it at night.
Another interesting thing is that even though the Moon is above the horizon for about 12 hours each day, it doesn't always match the length of daylight. In winter, when the days are shorter at certain places on Earth, we can see the Moon during the day for a shorter period of time.
Also, the lighting conditions on Earth can affect how well we can see the Moon during the day. So, if it's cloudy or foggy, it might be harder to see the Moon, even if it's daytime.
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