1. When it is closer to the horizon: This is an optical illusion called the Moon Illusion. Even though the Moon's actual size doesn't change, it appears larger when near the horizon because of how our brains perceive it in relation to objects on the ground. We unconsciously compare it to distant buildings, trees, etc., making it seem larger.

2. At perigee: This is the point in the Moon's orbit when it is closest to Earth. During perigee, the Moon can appear slightly larger than at its average distance. This effect is less dramatic than the Moon Illusion, and it's not always noticeable to the naked eye.

So, while both perigee and the Moon Illusion can make the Moon appear larger, the Moon Illusion is a more common and significant effect.