Erected to the southwest of the Palace-Temple, it has a quadrangular plan, measures 1.50 m per side and had protruding spikes at the top that were used to place stucco motifs and cast shadows. Its height is a little less than 5 m and to reach its base there is a ramp. Its location in an elevated sector probably obeys to the fact that this facilitated the observation of the sunrise and sunset. Abel Morales verified that this construction presents a deviation of 7 degrees to the east of the north. He also commented that it was important to register solstices and equinoxes, while suggesting that the shadows of the sun could indicate the beginning and end of agricultural tasks. Similarly, he noted that the variation of shadows may have served to mark the passage of time throughout the day.

The astronomical orientation of Tabasqueño buildings reminds us of the deep interest of pre-Hispanic priests in the night sky. In fact, practically all the monumental architecture of the Maya settlements is linked to diverse astronomical phenomena from the earliest times of the development of that civilization, or Preclassic period, which began several centuries before our era.