The Galactic alignment
Frank Waters' book inspired further speculation by John Major Jenkins in the mid-1980s, noting the correspondence of the December 21 date with the winter solstice in 2012. This date was in line with an idea he terms the Galactic Alignment.
In the Solar System, the planets and the Sun share roughly the same plane of orbit, known as the plane of the ecliptic. From our perspective on Earth, the Zodiacal constellations move along or near the ecliptic, and over time, appear to recede counter clockwise by one degree every 72 years. This movement is attributed to a slight wobble in the Earth's axis as it spins. As a result, approximately every 2160 years, the constellation visible on the early morning of the spring equinox changes. In Western astrological traditions, this signals the end of one astrological age (currently the Age of Pisces) and the beginning of another (Age of Aquarius). Over the course of 26,000 years, the precession of the equinoxes makes one full circuit around the ecliptic.
Just as the spring equinox in the northern hemisphere is currently in the constellation of Pisces, so the winter solstice is currently in the constellation of Sagittarius, which happens to be the constellation intersected by the galactic equator. Every year for the last 2000 years or so, on the winter solstice, the Earth, Sun and the galactic equator come into alignment, and every year, precession pushes the Sun's position a little way further through the Milky Way's band.
The Milky Way near Cygnus showing the lane of the Dark Rift which the Maya called the Xibalba be or Black Road.
Jenkins suggests that the Maya based their calendar on observations of the "dark rift", a band of black dust clouds in the Milky Way, which the Maya called the Xibalba be or Black Road. Jenkins claims that the Maya were aware of where the ecliptic intersected the Black Road and gave this position in the sky a special significance in their cosmology. According to the hypothesis, the Sun precisely aligns with this intersection point at the winter solstice of 2012. Jenkins claimed that the classical Mayans anticipated this conjunction and celebrated it as the harbinger of a profound spiritual transition for mankind. New Age proponents of the galactic alignment hypothesis argue that, just as astrology uses the positions of stars and planets to make claims of future events, the Mayans plotted their calendars with the objective of preparing for significant world events.
Critics suggest that the alignment in question takes place over a 36-year period, corresponding to the diameter of the Sun, with the most precise convergence having already occurred without incident in 1998. Also, Jenkins himself notes that there is no concrete evidence that the Maya were aware of precession.
