Memorial, New York City Plymouth Light, Gurnet Point, Plymouth, Massachusetts Gallery See also Blackhead Point, in Hong Kong, where a time ball was operated from 1908 to 1933 History of longitude Shepherd Gate Clock Time signal Weather ball Greenwich Mean Time (GMT) Times Square Ball List of objects dropped on New Year's Eve References External links List of time balls worldwide in 1876. Time ball/cannon hobbyist Time ball and cannon Association Navigational equipment Horology