Stargazers from Bishop's Stortford and surrounding areas are set to be treated to a once in a blue moon phenomenon on Friday (July 31).'Blue moon' is a term used by astronomers to describe the appearance of two full moons in the same month. The first of this month occurred on July 1.This occurrence marks the end of a three-year wait for astronomers since the last blue moon month in August 2012. The next will be in 2018.No-one knows for certain how the blue moon term came about but it is thought...
