Glossary term: 時間
Description: 我們每個人對時間都有一個基本的概念：從過去到現在，再到未來，事件一個接一個地發生。然而，時間並不是看得見、聽得到、聞得到、摸得到或嘗得到的東西。不過，它是可以測量的，而這正是時間在天文學和物理學中的重要性所在。
我們測量時間的方法是，將正在發生的事情的持續時間與時鐘上測量的持續時間進行比較，或者，對於較長的時間，與日曆上測量的持續時間進行比較。傳統上，這種時間測量是以地球自轉為基礎的。地球自轉一圈所需的時間（根據太陽的位置判斷）就是一天的長度。通常的會講一天分為 24 小時，每小時分為 60 分鐘，每分鐘分為 60 秒，這提供了額外的時間單位。
自 1967 年起，時間的定義改用銫-133 原子鐘測量的一秒時間（"SI 秒"）。在此基礎上定義了幾種時間系統，特別是世界時間（UTC），它被用於全世界的官方計時；還有所謂的儒略日及其變體，它是天文學中使用的一種連續計數天數的方法。
愛因斯坦的狹義相對論和廣義相對論表明，時鐘上流逝的時間既取決於時鐘的運動，也取決於重力的影響。這些相對論效應需要在高精度的時間測量中加以考慮，例如使用全球定位系統（GPS）衛星進行的測量。
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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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