You can't place a land or special tile on one of the 4 VP spaces. Those spaces are part of the orange hex spaces that are reserved for the sun movement. You earn the 4 VP if you place a land or special tile ADJACENT to one of the 4 VP spaces. See the rule book, bottom of page 13.
Got it, thanks. I think I read in a review or video somewhere that you get the points for placing a tile on it, and I thought, "that's strange, how does the sun move, then?" But it's all clear now.