Anar is the star that gives light to the world of Arda, an Eamon-like world in the plane of Eä.
The elves call it by various names including Anor, Vása, Aþâraigas, and Kalantar, while in Westron it's commonly called Uir or Ŷr.
The dark-themed display can be easier on the eyes.
Displayed as italicized passages, author's notes appear throughout the text of the Guide and give insight into how and where certain features of the world of Eamon originated.