Glossary term: 日晷
Description: 长期以来，人们一直用太阳在天空中的位置来定义时间，当地正午是太阳在地平线以上的最高点，狭义的一天指日出与日落之间的时间段，而广义上的一天则是指一个当地正午和下一个当地正午之间的时间段。日晷是一种将太阳的方向投射到带有标记的晷面的设备，通常是通过追踪被称为“晷针”的细长指针的阴影来实现定义时间。例如，当影子指向“12”的标记时，读出的时间为 12 点。简单的日晷只能显示太阳时，它与太阳在天空中的位置直接相关，更复杂的日晷则可以测定平均太阳时。
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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
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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