All Haab Months

The haab is the Maya solar calendar of three hundred and sixty-five days: eighteen months of twenty days each, followed by a short period of five days called Wayeb, regarded as unlucky and dangerous. Each of the eighteen named months (Pop, Wo, Sip, and the rest), runs its twenty days, and the year turns through them alongside the separate 260-day ritual count.

Combined with the 260-day tzolkin, the haab produces the Calendar Round, a cycle of fifty-two years after which a given tzolkin-and-haab date recurs, a fundamental unit of Mesoamerican timekeeping.

The haab approximates the solar year but, lacking a leap day, drifts slowly against the true seasons over long spans. The five-day Wayeb at the year's end was a liminal, ill-omened time, marked by rituals of caution. The haab worked together with the tzolkin and, for long spans, the Long Count.

The atlas gives each haab month its place in the year and its associations, and treats the Wayeb period. The haab belongs with the Maya calendrical material, the tzolkin day-signs and tones, and the Long Count, under Calendars & Time.