The Third Moon

The Third Moon, also known as The Silver Moon, is a key figure in many different religions because it’s the only moon whose cycle is always visible from earth- meaning that one can see its complete transformation from darkness to a full circle. It’s known as The Third Moon because it’s the third furthest away.
The First Moon, also known as The Golden Moon, is visible for two one week periods at varying times every year.
The Second Moon, also known as The Sapphire Moon, is only visible during the summer.
The Fourth Moon, also known as The Ruby Moon, is the closest moon. It becomes visible in a certain part of the world every three or so years.
Every 28 years, all moons are visible at the same time in a certain part of the world. 
There are legends that say all moons are visible at every part of the world every thousand years, but that seems unlikely, as it's impossible for the fourth moon to be seen from everywhere on the continent.

Type

Planetoid / Moon