Glossary term: 昼夜平分点
Description: 昼夜平分点(春分和秋分)是太阳在其年度黄道运行中穿越天球赤道的时刻。该词源自拉丁语“aequinoctium”,其中“aequus”意为“相等”,“nox”(属格形式为“noctis”)意为“夜晚”。在昼夜平分点这一天,不仅仅是接近赤道的区域,全球的昼夜长度大致相等。对于地球上的观察者,太阳在这一天从正东方升起,沿着天球赤道的路径运行,最后在正西方落下。每年有两次昼夜平分点,春分大约在3月20日,秋分在9月23日。在3月的春分,太阳看起来开始向北半球移动;而在9月的秋分,太阳看起来则向南半球移动。
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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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