The term Light Pollution refers to excessive and glaring artificial lighting, especially light that is scattered above the horizon. This is a very serious problem for astronomers, because it can prevent them from seeing objects in space.
On Saturday night, January 26th, a full moon will rise in the east just after sunset. Look at the full moon when it’s still near the horizon. Does it appear especially large to you? Then, look at the moon later this same night, when it’s higher in the sky. Does it appear smaller? For most people, the moon looks much larger when on the horizon. This is the "Moon Illusion."