Why does the Moon look close some nights and far away on other nights?

One summer evening when I was a child, I remember being mystified and then startled at a huge round shape slowly creeping up 

Astronomers have discussed the Moon illusion for centuries, and there are some facts they all agree on 

This is because your mind judges how big or small an object like the Moon is by comparing it with other, familiar things 

Imagine you are standing outside close to your house. Your house will look big, and if the Moon rises next to it, the Moon will look normal 

The illusion comes from the fact that the Moon is so far away that no matter where you are on Earth, the Moon always looks the same size 

It is actually the things your mind compares the Moon with – a house, a mountain or anything else 

Photographers use this trick to take spectacular images of distant objects with the Moon behind them