The Maya have many calendars that are used to calculate time. One is the Haab or monthly calendar.
It is a yearly cycle comprised of 18 months of 20 days in length plus one 5 day period
that marks the end and beginning of the cycle for a total of 365 days.

Because it does not include a “leap year”, its correspondence to our Gregorian calendar
shifts over time. In 2006 the Haab calendar will return to its starting point of 0 Pop on April 4.

These exquisite, perfectly-scaled, durable Hydro-Calcite reproductions of ancient Maya carvings are hand cast from molds
of hand-carved limestone reproductions created by modern Maya artists in the Chiapas highland rain-forests in Palenque, Mexico.