Finding this one moment, however, proved rather difficult. MacGregor used a smartphone app to predict the moon's trajectory, but cloud coverage and bulky equipment combined to foil his first night of shooting. The following evening, he left his tripod at home and managed to position himself along the Thames in time for the moon's appearance, but the rings had been lifted to allow for a boat to pass underneath. Finally, on the third night, MacGregor and his Canon 5D Mark III managed to capture that elusive moment, as pictured above. And it was certainly worth it.