Time Balls in New York

The tradition in New York's Times Square.

The actual notion of a ball "dropping" to signal the passage of time dates back long before New Year's Eve was ever celebrated in Times Square. The first "time-ball" was installed atop England's Royal Observatory at Greenwich in 1833. This ball would drop at one o'clock every afternoon, allowing the captains of nearby ships to precisely set their chronometers (a vital navigational instrument).

Around 150 public time-balls are believed to have been installed around the world after the success at Greenwich, though few survive and still work. The tradition is carried on today in places like the United States Naval Observatory in Washington, DC, where a time-ball descends from a flagpole at noon each day - and of course, once a year in Times Square, where it marks the stroke of midnight not for a few ships' captains, but for over one billion people watching worldwide.