"The Mayan Prophecy"," A Long Year is 26,000 orbits of the Earth around the Sun. An Earth Year ends on the 31st December, every year. It starts again on the 22nd December 2012, which is the first day of a new Long Year. The end of a Long Year is co-incidental with the alignment of the Earth, the Sun and the Galactic Centre on the Winter Solstice. Due to the rotation of the Heliosphere around the axis of our Sun, this will not occur for another 26,000 years, at which time it will mark the end of another Long Year of the Mayan Calendar, should the Maya still be here to celebrate it. It is a period of time equal to 26,000 Earth Years. The rotation of the Sun is tangential to its direction of orbit of the Galactic Centre. It is not just the sun that rotates but the whole solar system or Heliosphere. The Gregorian Calendar, of 365 days and 12 months, plots one revolution of the Earth's orbit around our Sun.