Vocab Bloom Hub

time-ball

/ˈtaɪm.bɔːl/

翻译: 指在预定时间沿垂直杆落下的一个大型球体,历史上用于天文台向船只和公众传递准确时间。

1 个条目

noun

/ˈtaɪm.bɔːl/C1formal
  • zh指在预定时间沿垂直杆落下的一个大型球体,历史上用于天文台向船只和公众传递准确时间。

A noun referring to a large ball that slides down a vertical staff at a predetermined time, historically used at observatories to signal the exact time to ships and the public.

  1. Time signal deviceC1formal

    A large ball that slides down a vertical pole at a predetermined time, historically used to signal the exact time, especially at observatories or ports.

    zh报时球

    • The time-ball at the Royal Observatory in Greenwich drops at 1 PM daily.
    • Sailors used to rely on the time-ball to set their marine chronometers.
    • The time-ball mechanism was an early method of public timekeeping.