Glossary term: 格林尼治標準時區（GMT）
Description: 歷史悠久的英國格林威治皇家天文臺所在的時區被稱為格林威治標準時區，或西歐時區。歷史上，格林威治標準時間（GMT）是皇家天文臺確定的平均太陽時，並被用作船上攜帶的海軍計時器的參考點。航海家通過使用六分儀或類似裝置進行觀察來確定當地正午的時間（一天中太陽到達的地平線以上的最高點），並將其與計時器顯示的格林威治標準時間進行比較，根據兩者的差值確定自己的地理經度。在現代系統中，GMT 時區的時間對應於協調世界時 (UTC)，寫為“UTC + 0h”。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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