June 2015 Gets An Extra Second - Here's How We Know | Video
Friday, June 26, 2015 - 14:00
in Astronomy & Space
Due to a "gradual slow down" of the Earth's rotation a 'leap second' has been added to June 30th. Scientists use a technique called Very Long Baseline Interferometry (VLBI) to measure how long it takes the Earth to make a full rotation.