Back Zeitball German Esfera de señales horarias Spanish Aikapallo Finnish Boule horaire French टाइम बॉल Hindi Time ball Italian 報時球 Japanese Tiedball NDS Tijdbal Dutch ਸਮਾਂ ਗੇਂਦ Punjabi
A time ball or timeball is a time-signalling device. It consists of a large, painted wooden or metal ball that is dropped at a predetermined time, principally to enable navigators aboard ships offshore to verify the setting of their marine chronometers. Accurate timekeeping is essential to the determination of longitude at sea.
Although time balls have since been replaced by electronic time signals, some time balls have remained operational as historical tourist attractions.