The moon will not turn green on April 20, 2016. A online rumor predicting a green full moon is nothing more than a lunar hoax. Credit: Space.com/Karl Tate Once again, a skywatching hoax has gone viral. To go along with the infamous "Mars hoax," which claims that the Red Planet will appear as large as the full moon in the sky; the "Nibiru cataclysm," a supposed disastrous encounter between Earth and a large planetary object; and "Zero-Gravity Day," when people on Earth supposedly can experience weightlessness, we now have the "nights of the green moon." This latest fallacy to sweep the blogosphere claims that on Wednesday (April 20), and again on May 29, the moon will appear to turn a shade of green. The full moon of April will occur on Friday, April 22. The explanation given for the verdant metamorphosis is that several planets are going to align (wrong!), causing the moon to glow with an eerie, greenish light for about 90 minutes. This spectacle is exceedingly rare (so we are told),