US Naval Observatory Library – Atlas Obscura

Atlas ObscuraThe U.S. Naval Observatory houses some of the world’s most cutting-edge scientific instruments, such as the Master Clock, an integrated network of a hundred atomic clocks that support the Global Positioning System. But tucked away in a corner on the … …read more Source:: Washington DC News From Google News

from WordPress http://ift.tt/2vjHj18
via IFTTT