啥是time ball 阿 我想要英文的解释
答案:2 悬赏:40 手机版
解决时间 2021-12-01 02:18
- 提问者网友：十年饮冰
- 2021-11-30 17:57
啥是time ball 阿 我想要英文的解释
最佳答案
- 五星知识达人网友：骨子里都是戏
- 2021-11-30 19:16
Time ball or timeball or ball time is an obsolete 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Although the use of time balls has been replaced by electronic time signals, some time balls have remained operational as historical tourist attractions.
From Wikipedia.
Although the use of time balls has been replaced by electronic time signals, some time balls have remained operational as historical tourist attractions.
From Wikipedia.
全部回答
- 1楼网友：人類模型
- 2021-11-30 20:31
Time ball or timeball or ball time is an obsolete 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.
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