Moon from apogee to perigee
The Moon is in an eliptical orbit, which means it is not completely round; the Moon moves towards and away from the Earth. This means that it appears to get bigger and smaller as it does so. The three images show this change in size as the Moon travels around it's orbit from apogee (farthest away) on the left to perigee (closest) on the right.
Note that the full moon does not always occur at perigee. As the Earth-Moon system moves around the Sun, and as the Moon's orbit precesses, the phase at which the Moon is closest to the Earth changes. Sometimes, the moon is full at apogee. These three images were all taken from the same orbit.
Moon from apogee to perigee
The Moon is in an eliptical orbit, which means it is not completely round; the Moon moves towards and away from the Earth. This means that it appears to get bigger and smaller as it does so. The three images show this change in size as the Moon travels around it's orbit from apogee (farthest away) on the left to perigee (closest) on the right.
Note that the full moon does not always occur at perigee. As the Earth-Moon system moves around the Sun, and as the Moon's orbit precesses, the phase at which the Moon is closest to the Earth changes. Sometimes, the moon is full at apogee. These three images were all taken from the same orbit.