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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lyttelton Timeball Station ： ウィキペディア英語版 Lyttelton Timeball Station The Lyttelton Timeball Station was a heritage-registered time ball station and prominent local landmark in Lyttelton, New Zealand. The station was significantly damaged by a series of earthquakes and aftershocks in 2010 and 2011, and finally collapsed on 13 June 2011 after a magnitude 6.4 aftershock. ==Context== A time ball is a large painted wooden or metal ball that drops at a predetermined time, principally to enable sailors to check their marine chronometers from their boats offshore. While latitude has long been easily determined first using an astrolabe and later a sextant, timekeeping is one way of enabling mariners to determine their longitude at sea. The key to this was accuracy, as an error of four seconds translates into of actual distance at the equator, and at latitude 60 degrees. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lyttelton Timeball Station」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.