TECHNOLOGY What is a black moon, why do they happen and when is the next one expected? By admin - December 18, 2017 0 511 Share on Facebook Tweet on Twitter BACK on September 30, 2016 a rare phenomenon hung high in our skies, the elusive Black Moon. The astrological phenomenon takes place when there are two new moons in a month. Here's all the info on the bizarre lunar event… 1 of 3