Top London Planetariums

Check out the Royal Observatory Greenwich, and stand astride the Prime Meridian: The line that divides the world’s eastern and western hemispheres and defines Greenwich Mean Time. With the help of an audio guide, you’ll then learn about the work of British honorary astronomers and hear fun facts about space, time, and the stars. Try to time your visit to see the fall of the red Time Ball by Flamsteed House; it’s among the world’s first public displays of time.