Friday the 13th and a Full Moon. That Won't Happen Again till 2049.
Full moons are said to make people act a bit wacky; perhaps the fluctuations of light crossing the moon's surface have an effect on the human psyche. Friday the 13th is said to bring bad luck. Whether you subscribe to that set of beliefs or not, some believe that people change their behavior on such days in order to minimize risk.
But no firm evidence exists that anything is stranger than usual when the moon looks like a coin in the sky, or that people are down on their luck on Friday the 13th. Scientists have examined both occasions and have come up with zilch.
If you see a dude in an old-school hockey mask chasing a werewolf (or vice versa) on Friday, here's why: Friday the 13th coincides with a full moon.
That said, only those living in Asia, Africa, Europe, South America — and those in the Eastern Time Zone — experienced the full moon on June 13. The full moon showed up at 12:11 a.m. ET, so anyone in time zone west of EDT saw the silver-dollar moon the day before, on June 12.
Friday the 13th hasn't fallen on the same day as a full Moon since Oct. 13, 2000, and it won't happen again until Aug. 13, 2049 — at least, if we're following Coordinated Universal Time (UTC), which is four hours ahead of EDT.
Anyone in New Zealand or the eastern tip of Asia will see a full moon on Friday, Jan. 13, 2017 (for the rest of the world, it will appear on Thursday, Jan. 12). Most of the United States will see the two events line up again on Friday, Sept. 13, 2019, though that full moon will fall on Saturday, Sept. 14, for most of the world.
To get a better visual picture of how moon visibility changes throughout the year, watch NASA's animation below.