Why are the outlines of the moon in the sky changing?

The moon, when moving around the earth, occupies a different position relative to the sun. We see only its illuminated part. The outlines of the visible part of the moon from the Earth are changing.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.