Discuss the various phases of moon?

Ans. During the new moon phase, the Moon is between the Sun and Earth because this placement means that the Moon's illuminated half is facing away from Earth, the Moon is not visible from the Earth. As the Moon continues its orbit, the illuminated side gradually becomes visible and is seen as a crescent. Over the next few days, the crescent appears to grow showing a larger portion of the illuminated side of the Moon each successive day. When half of its illuminated hemisphere becomes visible from Earth, the Moon appears as a half-disk also known as the "half moon." This is the first-quarter phase. The Moon continues to wax through gibbous phase in which more than half of the illuminated side is visible from the Earth. When the Moon reaches the point of its orbit at which it is on the opposite side of Earth from the Sun, the entire lit hemisphere is visible and it appears as a full moon — a complete circular disk. As the Moon proceeds around the rest of its orbit, it wanes from full to gibbous to half to crescent until the process starts over again with a new moon.