The Mayans were off by a year. Comet ISON will make its way close to Earth in Nov/Dec of 2013. Astronomers say that this bad boy could rival the Great Comet of 1680!
Space.com: Orbital calculations indicate that comet ISON will travel closest to the sun, less than 750,000 miles (1.2 million km) above the sun’s surface, making it a true “sungrazer,” on Nov. 28 (Thanksgiving Day in the United States).
The comet could eventually be bright enough to be visible in broad daylight around the time of its nearest approach to the sun. It will then travel toward Earth, passing within 40 million miles (64 million km) of our planet a month later.
That’s real close… and a long ways off for calculations to be 100% accurate. Get prepared for Discovery Channel’s newest show… Comet Preppers.