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The Haab is the Mayan solar calendar. It consists of 365 days, a close estimate to the true solar year. The year is divided into 18 months (uinals), which are then further divided into 20 days each. The uinals all have respective names, which are listed under each glyph in the right picture. The beginning day of an uinal was labeled as 0, such as 0 Pax. The second day would be labeled 1 Pax, the third 2 Pax, and so on, until 19 Pax. Instead of 20, a sign would substitute to signal the coming of a new uinal. Then the cycle would start anew in the next uinal, much like our modern calendar.
In addition, there is a nineteenth month, called the Wayeb. Since the Mayan calendar system was closely tied to their religion, the 5 days of Wayeb were considered to be significant in the sense of spirituality, though also unlucky. Those days were used to perform rituals and ceremonies at the sun's rise and set, along with personal reflections regarding one's blessings. Overall, it was an ancient ritual to prepare for the new year.
The Gregorian calendar, most obviously, adopted the 365-day year from the Haab
In addition, there is a nineteenth month, called the Wayeb. Since the Mayan calendar system was closely tied to their religion, the 5 days of Wayeb were considered to be significant in the sense of spirituality, though also unlucky. Those days were used to perform rituals and ceremonies at the sun's rise and set, along with personal reflections regarding one's blessings. Overall, it was an ancient ritual to prepare for the new year.
The Gregorian calendar, most obviously, adopted the 365-day year from the Haab
El Castillo, or the Temple of Kulkulcan, was the first format of the Haab calendar. On each side, the pyramid has a stairway with 91 steps each. 91 x 4 = 365. This towering pyramid plainly displays its central role in the ancient Mayans' lives, seeing as it also was named for one of the most important Mayan gods. To the ancient Mayans, time governed all.