The object is to collect a full disc of pie shaped wedges of an Aztec Calendar. Each round you bid on a differently-shaped wedge, and you can see the next 2 pieces up for auction. Add a couple of twists in that certain pieces can only be placed next to certain other types of pieces, and the pieces are two sided (you may use either side), and you have a bidding game.
Special thanks to BGG user - fbranham (Frank Branham) who had contributed the first English rules translation on 13 Jun 2004. I have further improved on the file which Frank had submitted. Attached is the new improved version.