TECHNOLOGY What is a supermoon, how often do they appear and when is the December 2017 full moon? By admin - December 2, 2017 0 487 Share on Facebook Tweet on Twitter BACK in November 2016, Brits were given a glimpse of the rare but stunning supermoon. If you didn't manage to see it thanks to the rubbish weather, there is another chance to catch the phenomenon this month. < p> 1 of 4