Question

Takes nearly 29.5 solar days for the moon to make one complete revolution around the earth. Although one half of the moon is always illuminated by the sun's light, the "lighted up' portion, of the moon appears to change shape as viewed from earth. "this is due to the changes in the relative position of the earth and the sun and the moon." during the first half the of moon's orbit the moon's apparent size grows (waxes). During the remaining half of its orbit, the shape of moon appears to decrease (wanes) in size.

Answer 1

this is because the moon moves in elliptical orbits around the Earth , hence when it closest to Earth it looks enlarged and shrunk when it far from Earth