A 5.2-metre-tall hourglass, with a diameter of 1 metre, displayed at a Japanese museum has been recognised by Guinness World Records as the world’s largest hourglass.The hourglass, built at the Nima Sand Museum in Oda, Shimane Prefecture, measures the duration of a year. It began ticking on January 1, 1991, using quartz sand from Yamagata Prefecture.
One tonne of the sand is designed to fall through the glass container over a year.
