From the information I've gathered over the years, there have always been the two moons of Drinal and Luclin. The Mistress of Shadows had kept a veil of darkness hidden around the moon which bears her name till it was destroyed in the Shattering.
The sun of Norrath is known simply as Ro. There are three additional planets in the Ro system (sometimes also classified as moons of Norrath), known as Anbeal, Trorsmang, and Cordan. You can view these celestial bodies in the Tower of the Moon in Maj'Dul (and they could be viewed from the isles of the Plane of Sky in old Everquest).