I've had enough of Sun being the powerful one. It's my job to shine for the Earth but she stole it!
In the year 200, when the Earth was fairly new, the Sun was always present and shined all day and every day. On Earth, it was always daytime and it was never dark. The sun was proud to being in charge and always made sure to show that to others. The sun especially liked to rub it in to the Earth's moon. The sun never let the moon do anything for the Earth.
I want MY job back!
The people on Earth started to get annoyed that it was always daytime and they could never sleep. They wanted a break from all the daytime and light from the sun.
The Earth is mine to shine for!
The suns boasting started to get to the moon. He started to get jealous that the sun gets to be in charge. She never let him do anything and he decided he wanted to change that.
The moon decided to take the position he was supposed to do. The sun wanted to be the one to shine for the Earth so she stole his job but he was now going to get it back.
The moon and sun didn't understand how to share and take turns, they either wanted everything or nothing at all.
No it's mine to shine for!
The people of Earth sided with the moon. They were very happy at the thought of being able to take a break from the suns bright light and go to sleep. The sun then stopped shining on Earth.