Title: Mayanism
Content:  having been predicted by the ancient Maya and others, is a much-anticipated event in Mayanism. Although Jenkins suggests that ancient Maya knowledge of this event was based on observations of the Dark Rift in the Milky Way as seen from Earth (this dark rift, it is said by some Mayan scholars, was believed by some Mayans to be one of the entrances to Xibalba), others see it as evidence of knowledge imparted via ancient contact with extraterrestrial intelligence. The relevance of modern Dark Rift observations to pre-Columbian and traditional Maya beliefs is strongly debated, and academic archaeologists reject all theories regarding extraterrestrial contact, but it is 
Title: Midwifery in Maya society
Content:  There are many things that the Mayans believe can be interpreted when a child is born. The Maya calendar for divination, or the "Sacred calendar", is believed to foretell a child's future, as some days are more auspicious than others. The calendar is important in Maya society for interpreting and shaping children's futures. However, Mayans also believe that midwives are able to foretell the life of a child based on the interpretations they can make from the markings on the umbilical cord and the amniotic sac. They believe that based on the markings from the first born, the sex, number and interval of future births can also be foretold. The most important markings are that of a future shaman (worms or flies clutched in the fist of a newborn), midwife (white mantle over the head, which comes from the amniotic membrane) and a baby that will endanger the survival of future siblings (born with a double whorl in its crown).
Title: Mesoamerica
Content:  also made future predictions concerning celestial events. These tables are remarkably accurate, given the technology available, and indicate a significant level of knowledge among Maya astronomers. Among the many types of calendars the Maya maintained, the most important include a 260-day cycle, a 360-day cycle or 'year', a 365-day cycle or year, a lunar cycle, and a Venus cycle, which tracked the synodic period of Venus. Maya of the European contact period said that knowing the past aided in both understanding the present and predicting the future (Diego de Landa). The 260-day cycle was a calendar to govern agriculture, observe religious 
Title: 2012 phenomenon
Content:  in their cosmology. Jenkins said that precession would align the Sun precisely with the galactic equator at the 2012 winter solstice. Jenkins claimed that the classical Maya anticipated this conjunction and celebrated it as the harbinger of a profound spiritual transition for mankind. New Age proponents of the galactic alignment hypothesis argued that, just as astrology uses the positions of stars and planets to make claims of future events, the Maya plotted their calendars with the objective of preparing for significant world events. Jenkins attributed the insights of ancient Maya shamans about the galactic center to their use of psilocybin mushrooms, psychoactive toads, and other psychedelics. Jenkins also associated the Xibalba be with a "world tree", drawing on studies of contemporary (not ancient) Maya cosmology.
Title: Maya civilization
Content:  produce prophecy, it also had some practical applications, such as providing aid in crop planting and harvesting. The priesthood refined observations and recorded eclipses of the sun and moon, and movements of Venus and the stars; these were measured against dated events in the past, on the assumption that similar events would occur in the future when the same astronomical conditions prevailed. Illustrations in the codices show that priests made astronomical observations using the naked eye, assisted by crossed sticks as a sighting device. Analysis of the few remaining Postclassic codices has revealed that, at the time of European contact, the Maya had recorded eclipse tables, calendars, and astronomical knowledge 
Title: Maya civilization
Content:  building at Chichen Itza align with the northernmost and southernmost extremes of Venus' path. Maya rulers launched military campaigns to coincide with the heliacal or cosmical rising of Venus, and would also sacrifice important captives to coincide with such conjunctions. Solar and lunar eclipses were considered to be especially dangerous events that could bring catastrophe upon the world. In the Dresden Codex, a solar eclipse is represented by a serpent devouring the kʼin ("day") hieroglyph. Eclipses were interpreted as the sun or moon being bitten, and lunar tables were recorded in order that the Maya might be able to predict them, and perform the appropriate ceremonies to ward off disaster.
Title: Maya religion
Content:  the 260 days; the cardinal directions; the ancestors of those present; important Mayan towns and archaeological sites; lakes, caves, or volcanoes; and deities taken from published editions of the Popol Vuh. People also come to these daykeepers to know about baby names, wedding dates and other special occasions. In the pre-Hispanic past, important divinatory dates relating to the prospects of the entire kingdom were sometimes given a mythological pedigree. At Palenque, for example, the auspicious day 9 Ik', chosen for the enthronement of one of its kings, is also stated to have witnessed, in a distant, mythical past, the enthronement of some of the patron deities of the kingdom.
Title: History of astronomy
Content:  Maya astronomical codices include detailed tables for calculating phases of the Moon, the recurrence of eclipses, and the appearance and disappearance of Venus as morning and evening star. The Maya based their calendrics in the carefully calculated cycles of the Pleiades, the Sun, the Moon, Venus, Jupiter, Saturn, Mars, and also they had a precise description of the eclipses as depicted in the Dresden Codex, as well as the ecliptic or zodiac, and the Milky Way was crucial in their Cosmology. A number of important Maya structures are believed to have been oriented toward the extreme risings and settings of Venus. To the ancient Maya, Venus was the patron of war and many recorded battles are believed to have been timed to the motions of this planet. Mars is also mentioned in preserved astronomical codices and early mythology. Although the Maya calendar was not tied to the Sun, John Teeple has proposed that the Maya calculated the solar year to somewhat greater accuracy than the Gregorian calendar. Both astronomy and an intricate numerological scheme for the measurement of time were vitally important components of Maya religion.
Title: Maddrax
Content:  of the tribes. Many of them had the prophetic dreams. They decide to shatter the parts of the machine over the land and dissolve all connections to what has happened by destroying all their writings (that's because we today think, the Mayan had no script) and to let all calendars end at 2012, as a warning what could come. In 2012 the man in white is back. He gathered a group of Indians that take the names of old Mayan gods. The man in white gives them supernatural powers. The group has hired an archaeologist to find the hidden parts of the 
Title: Midwifery in Maya society
Content:  objects, and the repetitious dreams, it is believed that they may also be summoned to mountains or other sacred places where they may encounter supernatural beings. Mayans believe that women who ignore their calling often fall ill, and if doctors are unable to determine a diagnosis for their ailments, they may even face death. They also believe that they are told in their dreams by supernatural beings that they will receive gifts from the families of the children they deliver and that they must not be greedy because many will give what they have it must be accepted with a goodness of heart.

Question: what did the ancient mayans predict?
Answer: The Hero Twins.