Full Moon 2018: December's Full Moon will be the LONGEST of the year THE upcoming December Full Moon will be the single longest Full Moon phase of the year, astronomers have spectacularly revealed. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Lions Eat Men Suspected of Poaching Rhinos. Some Saw ‘Karma.’The Science (and the Scientists) Behind Ant-ManEclipse 2018: When is the next lunar eclipse? How to watch the Blood Moon?Proof of Children’s Vaccinations? Italy Will Now Take Parents’ Word for ItEclipse 2018: Will there be another eclipse on August 21st like 2017?It’s Hot Out. Here Are Some Tips to Stay Cool.