The Cardassian sun was the star of the Cardassian system. At least five planets orbited it.

The Cardassian sun was particularly warm in the Hutet labor camp on Cardassia IV. (DS9: "The Homecoming")

In 2373, Tekeny Ghemor angrily told Dukat and Weyoun he would not stop publicly condemning Dukat and the Dominion "for a few short days under the Cardassian sun" in return for doing so. (DS9: "Ties of Blood and Water")