This is the name for the 3-part (4-part if you have a shadow campaign character) 'chain-quest' starting in Celestial Dome.
The three common quests in this chain are:
The shadow campaign only quest in this chain is:
In order to start your journey towards completing this multi-part quest, you will have to talk to Chief Astronomer Nomengalus. The detailed information on this string of quests starts here.
Shadow campaign characters only: