Glossary term: 日晷
Description: 長期以來，人們一直用太陽在天空中的位置來定義時間，當地正午是太陽在地平線以上的最高點，狹義的一天指日出與日落之間的時間段，而廣義上的一天則是指一個當地正午和下一個當地正午之間的時間段。日晷是一種將太陽的方向投射到帶有標記的晷面的設備，通常是通過追蹤被稱為“晷針”的細長指針的陰影來實現定義時間。例如，當影子指向“12”的標記時，讀出的時間為 12 點。簡單的日晷只能顯示太陽時，它與太陽在天空中的位置直接相關，更復雜的日晷則可以測定平均太陽時。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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