Each of the four stairways leading to the top of the pyramid has 91 steps, for a total of 364 steps. The top level of the pyramid brings the number of steps to 365 – number of days in the Maya year.

“Scholars used a surveyor’s transit, and were able to determine that the Maya knew the exact spot on the horizon where Venus would reverse course, once every eight years…In some sense the whole building says ‘I am looking out to the east to see Venus.”