Sun

The Sun is a large star located in the night skies above Earth. It's usually considered the opposite of the Moon.

My Little Pony comics
The sun was a sentient being in some stories.

Equestria Girls
The sun is located in the Solar System, surrounded by many planets. Here, the sun is depicted as a large, blue ball of fire. A model of the sun can be found at the Canterlot planetarium.